UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-Q

                 QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF
                    THE SECURITIES AND EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED APRIL 30, 2005   Commission file number 000-21109

                                CUNO INCORPORATED
- -------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)

           Delaware                                     06-1159240
 -------------------------------          -----------------------------------
 (State or other jurisdiction of          (I.R.S. Employer Identification No.)
 incorporation or organization)

400 Research Parkway, Meriden, Connecticut                06450
- ------------------------------------------               --------
 (Address of principal executive offices)               (Zip Code)

                                 (203) 237-5541
- -------------------------------------------------------------------------------
               Registrant's telephone number, including area code

                                 Not Applicable
- --------------------------------------------------------------------------------
   Former name, former address and former fiscal year, if changed since last
                                    report.

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934
during the preceding 12 months (or for such shorter periods that the registrant
was required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

Yes [X] No[ ]

Indicate by check mark whether the registrant is an accelerated filer (as
defined in Rule 12b-2 of the Exchange Act).

Yes [X] No [ ]

Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of the latest practicable date.

Common Stock, $0.001 Par Value - 17,280,123 shares as of April 30, 2005



                               CUNO INCORPORATED



                                                                                                      PAGE
                                                                                                     ------
                                                                                                  
PART I.  FINANCIAL INFORMATION

Item 1.  Condensed Consolidated Financial Statements (Unaudited)

         Consolidated Statements of Income                                                             1-2

         Consolidated Balance Sheets                                                                     3

         Consolidated Statements of Cash Flows                                                           4

         Notes to Unaudited Condensed Consolidated Financial Statements                               5-12

Item 2.  Management's Discussion and Analysis of Financial Condition and Results of
         Operations                                                                                  13-26

Item 3.  Quantitative and Qualitative Disclosures About Market Risk                                     26

Item 4.  Controls and Procedures                                                                        27

PART II. OTHER INFORMATION

Item 4.  Submission of Matters to a Vote of Security Holders                                            28

Item 6.  Exhibits and Reports on Form 8-K                                                               28



                               CUNO INCORPORATED
                 CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)
           (dollars in thousands, except share and per-share amounts)



                                                           THREE MONTHS ENDED
                                                                APRIL 30,
                                                         2005              2004
                                                     ------------      ------------
                                                                 
Net sales                                            $    104,725      $     82,745
Less costs and expenses:
    Cost of products sold                                  59,970            43,676
    Selling, general and administrative expenses           26,298            22,434
    Research, development and engineering                   5,157             4,036
    Amortization expense                                      650                76
                                                     ------------      ------------
                                                           92,075            70,222
                                                     ------------      ------------

Operating income                                           12,650            12,523

Nonoperating income (expense):
    Interest expense                                         (561)              (87)
    Interest and other income, net                            342               216
                                                     ------------      ------------
                                                             (219)              129
                                                     ------------      ------------

Income before income taxes                                 12,431            12,652

Provision for income taxes                                  4,003             4,208

                                                     ------------      ------------
Net income                                           $      8,428      $      8,444
                                                     ============      ============

Basic earnings per common share                      $       0.50      $       0.51

Diluted earnings per common share                    $       0.48      $       0.49

Basic shares outstanding                               16,958,565        16,694,466

Diluted shares outstanding                             17,460,183        17,214,286


See accompanying notes.

                                      -1-


                               CUNO INCORPORATED
                 CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)
           (dollars in thousands, except share and per-share amounts)



                                                            SIX MONTHS ENDED
                                                                APRIL 30,
                                                         2005               2004
                                                     ------------      -------------
                                                                 
Net sales                                            $    204,101      $    158,154
Less costs and expenses:
    Cost of products sold                                 116,900            84,229
    Selling, general and administrative expenses           50,962            42,604
    Research, development and engineering                  10,081             8,225
    Amortization expense                                    1,303               144
                                                     ------------      ------------
                                                          179,246           135,202
                                                     ------------      ------------

Operating income                                           24,855            22,952

Nonoperating income (expense):
    Interest expense                                       (1,084)             (170)
    Interest and other income, net                            565               366
                                                     ------------      ------------
                                                             (519)              196
                                                     ------------      ------------

Income before income taxes                                 24,336            23,148

Provision for income taxes                                  8,077             7,699

                                                     ------------      ------------
Net income                                           $     16,259      $     15,449
                                                     ============      ============

Basic earnings per common share                      $       0.96      $       0.93

Diluted earnings per common share                    $       0.93      $       0.90

Basic shares outstanding                               16,931,554        16,690,853

Diluted shares outstanding                             17,459,076        17,211,187


See accompanying notes.

                                      -2-


                                CUNO INCORPORATED
                     CONSOLIDATED BALANCE SHEETS (UNAUDITED)
                      (in thousands, except share amounts)



                                                                       APRIL 30,     OCTOBER 31,
                                                                         2005           2004
                                                                       ---------      ---------
                                                                               
ASSETS
Current assets
    Cash and cash equivalents                                          $  20,717      $  23,359
    Accounts receivable, less allowances for
      doubtful accounts of $2,086 and $2,230, respectively                91,920         89,593
    Inventories, net                                                      50,516         47,275
    Deferred income taxes                                                 14,520         12,656
    Prepaid expenses and other current assets                              6,993          5,974
                                                                       ---------      ---------
        Total current assets                                             184,666        178,857

Noncurrent assets
    Deferred income taxes                                                    761            892
    Goodwill                                                             104,566        103,977
    Other intangible assets, net                                          31,876         32,894
    Prepaid pension costs                                                  9,786          9,785
    Other noncurrent assets                                                5,574          4,832
    Property, plant and equipment, net                                   112,067        103,321
                                                                       ---------      ---------
        Total assets                                                   $ 449,296      $ 434,558
                                                                       =========      =========
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities
    Current portion of long-term debt                                  $     322      $     276
    Bank loans                                                            10,476         11,048
    Accounts payable                                                      33,984         33,469
    Accrued payroll and related taxes                                     16,094         20,329
    Other accrued expenses                                                11,371         11,502
    Accrued income taxes                                                   3,916          4,539
                                                                       ---------      ---------
        Total current liabilities                                         76,163         81,163

Noncurrent liabilities
    Long-term debt, less current portion                                  68,494         75,569
    Deferred income taxes                                                 21,741         16,662
    Retirement benefits                                                    4,599          4,396
    Other noncurrent liabilities                                             970            789
                                                                       ---------      ---------
        Total noncurrent liabilities                                      95,804         97,416

STOCKHOLDERS' EQUITY
    Preferred Stock, $.001 par value; 2,000,000 shares
        authorized, no shares issued                                           -              -
    Common Stock, $.001 par value; 50,000,000 shares authorized,
        17,280,123 and 17,122,698 shares issued and outstanding               17             17
    Treasury Stock, at cost (2,747 shares)                                   (57)           (57)
    Additional paid-in-capital                                            68,195         63,413
    Unearned compensation                                                 (4,597)        (2,164)
    Accumulated other comprehensive loss --
          Foreign currency translation adjustments                        10,754          7,966
          Minimum pension liability                                         (386)          (386)
          Change in fair value of derivative financial instruments           (46)             -
                                                                       ---------      ---------
                                                                          10,322          7,580
    Retained earnings                                                    203,449        187,190
                                                                       ---------      ---------
        Total stockholders' equity                                       277,329        255,979
                                                                       ---------      ---------
        Total liabilities and stockholders' equity                     $ 449,296      $ 434,558
                                                                       =========      =========
See Accompanying Notes.


                                      -3-


                                CUNO INCORPORATED
                CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)
                             (dollars in thousands)



                                                                               SIX MONTHS ENDED
                                                                                    APRIL 30,
                                                                              2005          2004
                                                                            ---------     --------
                                                                                    
OPERATING ACTIVITIES
   Net income                                                               $ 16,259      $ 15,449
   Adjustments to reconcile net income to net cash
     provided by operating activities:
      Depreciation and amortization                                            7,965         5,417
      Noncash compensation recognized under employee stock plans                 696           412
      Losses (gains) on sales of property, plant and equipment                   (79)           30
      Pension funding less than expense                                          117           171
      Deferred income taxes                                                    3,708           251
      Changes in operating assets and liabilities, net of acquisitions:
           Accounts receivable                                                (1,507)       (8,802)
           Inventories                                                        (2,705)       (5,506)
           Prepaid expenses and other current assets                          (1,956)       (1,207)
           Accounts payable and accrued expenses                              (5,254)          239
           Accrued income taxes                                                 (988)        2,424
                                                                            --------      --------
Net cash provided by operating activities                                     16,256         8,878

INVESTING ACTIVITIES
      Proceeds from sales of property, plant and equipment                       100             -
      Acquisition of companies, net of cash acquired                               -          (554)
      Capital expenditures                                                   (13,952)       (8,543)
      Other, net                                                                (692)         (574)
                                                                            --------      --------
Net cash used for investing activities                                       (14,544)       (9,671)

FINANCING ACTIVITIES
      Principal payments on long-term debt                                    (7,086)         (784)
      Principal payments on short-term debt                                   (2,824)         (612)
      Proceeds from short-term debt                                            2,336             -
      Net borrowings under short-term bank loans                               1,673         2,964
      Proceeds from stock options exercised                                    1,028           613
                                                                            --------      --------
Net cash (used for) provided by financing activities                          (4,873)        2,181

Effect of exchange rate changes on cash and cash equivalents                     519           746
                                                                            --------      --------
Net change in cash and cash equivalents                                       (2,642)        2,134
Cash and cash equivalents -- beginning of period                              23,359        57,603
                                                                            --------      --------
Cash and cash equivalents -- end of period                                  $ 20,717      $ 59,737
                                                                            ========      ========


See accompanying notes.

                                      -4-


CUNO INCORPORATED
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(amounts in thousands, except share and per-share amounts)

APRIL 30, 2005

NOTE 1 - ORGANIZATION AND ACCOUNTING POLICIES

      CUNO Incorporated (the "Company", "CUNO", or "we") designs, manufactures
and markets a comprehensive line of filtration products for the separation,
clarification and purification of liquids and gases. Our products, which include
proprietary depth filters and semi-permeable membrane filters, are sold in the
potable water, healthcare and fluid processing markets throughout the world.

      The accompanying unaudited condensed consolidated financial statements
have been prepared in accordance with accounting principles generally accepted
in the United States of America for interim financial information and with the
instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do
not include all of the information and footnotes required by accounting
principles generally accepted in the United States of America for annual
financial statements. In the opinion of management, all adjustments which are of
a normal recurring nature considered necessary for a fair presentation of the
financial position and results of operations for the interim periods set forth
herein have been included. The accounts of the Company and all of its
subsidiaries are included in the consolidated financial statements. All
significant intercompany accounts and transactions are eliminated in
consolidation. Operating results for the interim periods are not necessarily
indicative of the results that may be expected for the full year. These interim
unaudited financial statements should be read in conjunction with the Company's
Annual Report on Form 10-K for the year ended October 31, 2004.

      The preparation of financial statements in accordance with accounting
principles generally accepted in the United States of America requires
management to make estimates and assumptions that affect the amounts reported in
the financial statements and disclosures made in the accompanying notes to the
financial statements. Actual results could differ from those estimates.

      Certain prior year amounts have been reclassified to conform to current
year presentation.

INVENTORIES:

      Inventories are stated at the lower of cost or market. Inventories in the
United States of America are primarily valued by the last-in, first-out (LIFO)
cost method. The methods used for all other inventories are first-in, first-out
(FIFO) and average cost. An actual valuation of inventory under the LIFO method
can be made only at the end of each year based on the inventory levels and costs
at that time. Accordingly, interim LIFO calculations must necessarily be based
on our estimates of expected year-end inventory levels and costs. Because these
are subject to many factors beyond management's control, interim results are
subject to the final year-end LIFO inventory valuation.

      Inventories consist of the following:



                    APRIL 30,  OCTOBER 31,
                     2005         2004
                    -------     -------
                  (unaudited)
                         
Raw materials       $18,702     $18,805
Work-in-process       5,662       6,215
Finished goods       26,152      22,255
                    -------     -------
                    $50,516     $47,275
                    =======     =======


                                      5


ACCOUNTS PAYABLE

      At April 30, 2005 and October 31, 2004, approximately $4,094 and $2,478,
respectively, representing book overdrafts of cash accounts, were reclassified
to accounts payable.

INTEREST AND OTHER INCOME, NET:

      Interest and other income (expense), net consisted of the following:



                             THREE MONTHS ENDED    SIX MONTHS ENDED
                                  APRIL 30,           APRIL 30,
                                2005     2004       2005      2004
                                ----     ----       ----      ----
                                                  
Interest income                $ 157     $ 181      $ 329     $ 420
Exchange gains (losses)           93        11        104        (2)
Gains (losses) on sales of
 property, plant, and
 equipment                        88       (38)       104       (30)
Other, net                         4        62         28       (22)
                               -----     -----      -----     -----
                               $ 342     $ 216      $ 565     $ 366
                               =====     =====      =====     =====


EARNINGS PER SHARE:

         Basic earnings per common share is based on net income divided by the
weighted average number of common shares outstanding during the period. Diluted
earnings per common share is based on net income divided by the weighted average
number of common shares outstanding during the period, including the effect of
stock equivalents, where such effect is dilutive. Earnings per share for the
three months ended April 30, 2005 and 2004 is calculated as follows:



                                                 APRIL 30,       APRIL 30,
                                                   2005            2004
                                                -----------     -----------
                                                          
NUMERATOR:

  Net income                                    $     8,428     $     8,444
                                                ===========     ===========

DENOMINATORS:

 Weighted average shares outstanding             16,958,565      16,694,466
                                                -----------     -----------
 DENOMINATOR FOR BASIC EARNINGS PER SHARE        16,958,565      16,694,466
                                                ===========     ===========

 Weighted average shares outstanding             16,958,565      16,694,466
 Effect of dilutive employee stock options          298,887         407,061
 Effect of dilutive restricted shares               202,731         112,759
                                                -----------     -----------
 DENOMINATOR FOR DILUTED EARNINGS PER SHARE      17,460,183      17,214,286
                                                ===========     ===========

Basic earnings per share                        $      0.50     $      0.51
Diluted earnings per share                      $      0.48     $      0.49


      Approximately 104,618 and 216,000 shares (before the effects of the
treasury stock method) related to options to purchase common stock and unvested
restricted stock were excluded from the computations of diluted earnings per
share at April 30, 2005 and 2004, respectively, because the exercise price was
greater than the average market price of the common stock during the periods.

                                       6


Earnings per share for the six months ended April 30, 2005 and 2004 is
calculated as follows:



                                                 APRIL 30,        APRIL 30,
                                                   2005             2004
                                                -----------     -----------
                                                          
NUMERATOR:

 Net income                                     $    16,259     $    15,449
                                                ===========     ===========

DENOMINATORS:

 Weighted average shares outstanding             16,931,554      16,690,853
 DENOMINATOR FOR BASIC EARNINGS PER SHARE        16,931,554      16,690,853
                                                ===========     ===========

 Weighted average shares outstanding             16,931,554      16,690,853
 Effect of dilutive employee stock options          315,132         407,491
 Effect of dilutive restricted shares               212,390         112,843
                                                -----------     -----------
 DENOMINATOR FOR DILUTED EARNINGS PER SHARE      17,459,076      17,211,187
                                                ===========     ===========

Basic earnings per share                        $      0.96     $      0.93
Diluted earnings per share                      $      0.93     $      0.90


      Approximately 92,368 and 216,000 shares (before the effects of the
treasury stock method) related to options to purchase common stock and unvested
restricted stock were excluded from the computations of diluted earnings per
share for the six-months ended April 30, 2005 and 2004, respectively, because
the exercise price was greater than the average market price of the common stock
during the periods.

COMPREHENSIVE INCOME:

      Total comprehensive income was comprised of the following:



                                                    THREE MONTHS ENDED           SIX MONTHS ENDED
                                                         APRIL 30,                   APRIL 30,
                                                    2005          2004          2005          2004
                                                  --------      --------      --------      --------
                                                                                
Net income                                        $  8,428      $  8,444      $ 16,259      $ 15,449

Other comprehensive income (loss):
  Change in fair value of derivative
     financial instruments, net of deferred
     income taxes of $10, $189, ($15) and $69           20           302           (23)          100

  Losses related to derivative financial
    instruments reclassified into earnings
    from other comprehensive income,
    net of $9, $30, $12 and $55 tax                    (16)          (47)          (23)          (89)
    benefit

  Foreign currency translation adjustments             348        (2,577)        2,788         1,058
                                                  --------      --------      --------      --------

         Total comprehensive income               $  8,780      $  6,122      $ 19,001      $ 16,518
                                                  ========      ========      ========      ========


                                       7


EMPLOYEE STOCK OPTIONS:

      The Company has stock option plans under which employees and directors
have options to purchase Common Stock. The Company applies APB 25, "Accounting
for Stock Issued to Employees" and related interpretations in accounting for its
stock option plans. The Company has adopted those provisions of Statement of
Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation" (FAS 123) and Statement of Financial Accounting Standards No. 148,
"Accounting for Stock-Based Compensation - Transition and Disclosure - an
amendment of Statement of Financial Accounting Standards No. 123", which require
the disclosure of pro forma effects on net income and earnings per share as if
compensation cost had been recognized based upon the fair value method at the
date of grant for options awarded.

      Pro forma information regarding net income and earnings per share is
required by FAS 123, which requires that the information be determined as if we
had accounted for our employee stock options under the fair-value method of FAS
123. The fair value for the options granted during the following periods were
estimated at the date of grant using the Black-Scholes pricing model with the
following weighted average assumptions:



                                       THREE MONTHS ENDED  SIX MONTHS ENDED
                                             APRIL 30,         APRIL 30,
                                          2005     2004      2005      2004
                                          ----     ----    ------    ------
                                                         
Volatility                                35.44%    N/A     34.87%    23.39%
Risk-free interest rate                    4.16%    N/A      3.75%     3.46%
Expected option life                     5 years    N/A    5 years   5 years
Dividend yield                                -     N/A         -         -


      N/A - There were no stock option grants during the quarter ended April 30,
2004

      The following table illustrates the effect on net income and earnings per
share as if compensation cost had been recognized based on the fair value of the
options at the grant dates for awards under those plans consistent with FAS 123,
as amended, using the Black-Scholes fair value method for option pricing.



                                                                  THREE MONTHS ENDED            SIX MONTHS ENDED
                                                                      APRIL  30,                   APRIL 30,
                                                                  2005          2004          2005           2004
                                                               ---------     ---------     ----------     ----------
                                                                                              
Net income, as reported                                        $   8,428     $   8,444     $   16,259     $   15,449

Add: Stock-based compensation expense included in reported
net income, net of income taxes                                      295           147            466            276

Deduct: Total stock-based compensation expense determined
under fair value based method for all awards, net of
income taxes                                                         706           616          1,346          1,236
                                                               ---------     ---------     ----------     ----------
Pro forma net income                                           $   8,017     $   7,975     $   15,379     $   14,489
                                                               =========     =========     ==========     ==========
Earnings per share:
         Basic - as reported                                   $    0.50     $    0.51     $     0.96     $     0.93
         Basic - pro forma                                     $    0.47     $    0.48     $     0.91     $     0.87
         Diluted - as reported                                 $    0.48     $    0.49     $     0.93     $     0.90
         Diluted - pro forma                                   $    0.46     $    0.46     $     0.88     $     0.85


                                       8


NEWLY ISSUED ACCOUNTING STANDARD

      In December 2004, the FASB issued SFAS No. 123 (revised 2004),
"Share-Based Payment". This standard will require the Company to measure the
cost of employee services received in exchange for an award of equity
instruments based on the grant-date fair value of the award. The cost will be
recognized over the period during which an employee is required to provide
service in exchange for the award. This Standard is effective as of the
beginning of the first annual reporting period that begins after June 15, 2005.
This Standard will apply to all awards granted after the required effective date
and to awards modified, repurchased or canceled after that date. We are
currently evaluating the requirements and application of this standard and
expect the adoption to have an adverse effect on our consolidated statements of
income.

NOTE 2 - GOODWILL AND INTANGIBLE ASSETS

      Goodwill amounted to $104,566 and $103,977 at April 30, 2005 and October
31, 2004, respectively. The increase in goodwill is attributable to changes in
foreign exchange rates.

      Other intangible assets amounted to $31,876 and $32,894 at April 30, 2005
and October 31, 2004, respectively. The decrease in the balance of other
intangible assets is related primarily to amortization, which amounted to $650
and $1,303, respectively, for the three-month and six-month periods ended April
30, 2005, partially offset by the impact of fluctuations in foreign exchange
rates.

NOTE 3 - BENEFIT PLANS

Components of Net Periodic Benefit Cost are as follows:



                                          THREE MONTHS ENDED        SIX MONTHS ENDED
                                               APRIL 30,                 APRIL 30,
                                           2005         2004         2005         2004
                                           ----         ----         ----         ----
                                                                     
Service cost                              $   790      $   683      $ 1,584      $ 1,366
Interest cost                                 688          633        1,377        1,266
Expected return on plan assets               (880)        (823)      (1,762)      (1,646)
Amortization of transition asset                1           20            2           40
Amortization of prior service cost             46          102           92          204
Amortization of net loss                      237          141          474          282
                                          -------      -------      -------      -------
            Net periodic benefit cost     $   882      $   756      $ 1,767      $ 1,512
                                          =======      =======      =======      =======


      During the three and six months ended April 30, 2005, employer
contributions of $816 and $1,650, respectively, were made to the pension plans.
We currently anticipate contributing an additional $1,640 to fund our pension
plans in fiscal 2005 for a total expected contribution of $3,290.

      The pension assumptions used to determine our October 31, 2004 plan
liabilities and the fiscal 2005 pension expense are as follows:



                                                 US PLANS  JAPAN PLANS
                                                 --------  -----------
                                                     
Weighted-average discount rate                     6.00%      2.25%
Rates of increases in compensation levels          4.00%      2.25%
Expected long-term rate of return on assets        8.75%      4.75%


                                       9


      We determine our assumptions based on current economic and market data, as
well as expectations of future economic and market data. Included in our
analysis are company-specific considerations, such as current and future
investment allocations, participant demographics, and employee compensation
strategies.

      Pension expense for fiscal 2005 is determined at the beginning of the
fiscal year and expensed ratably throughout the year. Our estimate of pension
expense to be recognized in 2005 is $3,500 ($3,100 in fiscal 2004).

NOTE 4 - ACQUISITIONS

      In the first quarter of 2004, we completed two acquisitions in Europe for
total consideration of $554. The amount of goodwill and other intangible assets
recorded in connection with these two acquisitions amounted to $340 and $480,
respectively. Neither of these acquisitions had a material impact on the
Company's historical financial statements or pro forma operating results.

      On August 2, 2004 we acquired 100 percent of the outstanding common shares
of WTC Industries and subsidiary ("WTC"). The aggregate purchase price was
$115,193 (net of $569 of cash acquired). The results of operations of WTC are
included in our financial statements from August 2, 2004, the date of
acquisition, and thereafter.

NOTE 5 - SEGMENT DATA

      Segment information has been prepared in accordance with Statement of
Financial Accounting Standards No. 131, "Disclosures about Segments of an
Enterprise and Related Information." CUNO is organized into five geographic
segments, as the Company's chief operating decision makers are responsible for
managing our global operations based on geographic regions. Our geographic
segments include: North America, Europe, Japan, Asia/Pacific and Latin America.
Each of these operations are led and managed by a local General Manager who is
responsible for the profitability of their respective geographic segment. Each
of these geographic operations in turn manufactures and sells products into our
three main filtrations markets; potable water, healthcare and fluid processing.
Each geographic segment manufactures and sells products in each of the three
markets. The geographic segment managers are responsible for managing their
respective resources with oversight and review by the CEO.

      The Company does not present segment information by market as our
individual market focus is limited to worldwide sales, with assigned
responsibility for expanding worldwide sales within each respective market.

Financial information by geographic operating segments is summarized below:



                                    THREE MONTHS ENDED             SIX MONTHS ENDED
                                         APRIL 30,                     APRIL 30,
                                    2005           2004           2005           2004
                                 ---------      ---------      ---------      ---------
                                                                  
NET SALES:
Europe                           $  21,359      $  20,424      $  40,849      $  37,058
Japan                               13,464         11,393         25,826         21,214
Asia/Pacific                        14,773         11,812         27,684         22,447
Latin America                        4,240          3,482          7,804          6,969
                                 ---------      ---------      ---------      ---------
    Subtotal - Foreign sales        53,836         47,111        102,163         87,688
North America                       67,158         50,517        131,906         96,325
Intercompany sales                 (16,269)       (14,883)       (29,968)       (25,859)
                                 ---------      ---------      ---------      ---------
         Total net sales         $ 104,725      $  82,745      $ 204,101      $ 158,154
                                 =========      =========      =========      =========


                                       10


Our sales by market are summarized below:



                                   THREE MONTHS ENDED        SIX MONTHS ENDED
                                        APRIL 30,                APRIL 30,
                                   2005         2004         2005         2004
                                 --------     --------     --------     --------
                                                            
NET SALES:
Potable Water                    $ 53,975     $ 37,940     $106,272     $ 72,793
Fluid Processing                   24,332       21,143       47,571       41,413
Healthcare                         26,418       23,662       50,258       43,948
                                 --------     --------     --------     --------
        Total net sales          $104,725     $ 82,745     $204,101     $158,154
                                 ========     ========     ========     ========


Our operating income by segment is detailed below:



                                    THREE MONTHS ENDED          SIX MONTHS ENDED
                                        APRIL 30,                   APRIL 30,
                                   2005          2004          2005          2004
                                 --------      --------      --------      --------
                                                               
OPERATING INCOME:
North America                    $  5,791      $  6,917      $ 12,126      $ 13,077
Europe                              1,878         1,948         2,914         3,073
Japan                               2,121         1,448         4,474         2,506
Asia/Pacific                        2,403         1,879         4,564         3,612
Latin America                         457           331           777           684
                                 --------      --------      --------      --------
      Total operating income       12,650        12,523        24,855        22,952
                                 --------      --------      --------      --------
Interest expense                     (561)          (87)       (1,084)         (170)
Other, net                            342           216           565           366
                                 --------      --------      --------      --------
Income before income taxes       $ 12,431      $ 12,652      $ 24,336      $ 23,148
                                 ========      ========      ========      ========


Interest expense and other income (expense) have not been allocated to segments.

      Our assets by segment are detailed below:



                           APRIL 30,      OCTOBER 31,
                              2005           2004
                           ---------      -----------
                                    
ASSETS:
North America              $ 361,378      $ 345,359
Europe                        70,729         59,605
Japan                         42,292         37,100
Asia/Pacific                  35,618         31,323
Latin America                 14,512         14,047
General Corporate             20,690         23,359
Eliminations and other       (95,923)       (76,235)
                           ---------      ---------
Total Assets               $ 449,296      $ 434,558
                           =========      =========


      General corporate assets, consisting of cash, are not allocated to
segments.

NOTE 6 - COMMITMENTS AND CONTINGENCIES

                                       11


      The Company is subject to various legal actions, governmental audits, and
proceedings relating to various matters incidental to its business including
product liability and environmental claims. While the outcome of such matters
cannot be predicted with certainty, in the opinion of management, after
reviewing such matters and consulting with our counsel and considering any
applicable insurance or indemnifications, any liability which may ultimately be
incurred is not expected to materially affect the consolidated financial
position, cash flows or results of operations of the Company.

      Currently, we have self-insurance limits for workers' compensation,
product liability and employee medical claims. Our workers' compensation
policies have per-individual deductibles of $350, our product liability policy
has a $250 per claim deductible and our medical plan for employees has a
stop-loss of $200 per individual.

NOTE 7 - SUBSEQUENT EVENT

      On May 11, 2005, CUNO entered into an Agreement and Plan of Merger with 3M
Company. On the terms and subject to the conditions of the Merger Agreement,
which has been approved by the Board of Directors of each of CUNO and 3M, at the
effective time of the Merger, each share of common stock, par value $0.001, of
CUNO will be converted into the right to receive $72.00 in cash.

      Consummation of the Merger is subject to customary conditions, including
(i) approval of the holders of CUNO Common Stock, (ii) absence of any law or
order prohibiting the consummation of the Merger and (iii) expiration or
termination of the Hart-Scott-Rodino waiting period and obtaining certain other
regulatory approvals.

                                       12


      ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
      RESULTS OF OPERATIONS
amounts in thousands, except share and per-share amounts)

      Management's discussion and analysis of financial condition and results of
operations ("MD&A") is provided as a supplement to the accompanying unaudited
interim condensed consolidated financial statements and footnotes to provide an
understanding of our financial position, changes in our financial position and
results of our operations. Our MD&A is organized as follows:

        -       COMPANY OVERVIEW. This section provides a general description of
                our business.

        -       COMPANY RISK FACTORS. This section describes the material risks
                inherent in our business that investors should be aware of.

        -       CAUTION CONCERNING FORWARD-LOOKING STATEMENTS. This section
                discusses how certain forward-looking statements made by us
                throughout the MD&A and elsewhere in this report are based on
                management's present expectations about future events and are
                inherently susceptible to uncertainty and changes in
                circumstances.

        -       CRITICAL ACCOUNTING POLICIES. This section discusses those
                accounting policies that are both considered important to our
                financial statements and require significant judgment and
                estimates on the part of management in their application.

        -       RESULTS OF OPERATIONS. This section provides an analysis of our
                recent results of operations, including a brief description of
                transactions and events that impact the comparability of these
                results.

        -       FINANCIAL POSITION AND LIQUIDITY. This section provides an
                analysis of our cash position and cash flows, as well as a
                discussion of our financing arrangements.

        Other information is presented in Items 3, 4 and elsewhere as follows:

        -       QUALITATIVE AND QUANTITATIVE DISCLOSURES ABOUT MARKET RISK. This
                section discusses information about the various market risks we
                are exposed to as of the end of the latest fiscal period
                presented.

        -       CONTROLS AND PROCEDURES. This section discusses the conclusions
                of our executive officer and principal financial officer about
                the effectiveness of our disclosure controls and procedures.

        -       OTHER INFORMATION. This section describes material developments
                in the business or markets in which we compete, as well as any
                other information important to our stakeholders.

COMPANY OVERVIEW

        CUNO is a world leader in the designing, manufacturing and marketing of
a comprehensive line of filtration products for the separation, clarification
and purification of liquids and gases. Our products, which include proprietary
depth filters and semi-permeable membrane filters, are used in the potable
water, fluid processing, and healthcare markets. These products, most of which
are disposable, effectively remove contaminants that range in size from
molecules to sand particles. Our sales are approximately balanced between
domestic and international markets. Our objective is to provide high value-added
products and premium customer service. Our proprietary manufacturing processes
result in products that lower customers' operating expenses and improve the
quality of customers' end products by providing longer lasting, higher quality
and more efficient filters.

                                       13


COMPANY RISK FACTORS

RISKS ASSOCIATED WITH INTERNATIONAL OPERATIONS

        Approximately 50% of our net sales are derived from international
operations. Consequently, our reported financial results may be adversely
affected by significant fluctuations in the value of the US dollar in comparison
to local currencies in the countries in which we operate outside the US. We
manufacture products in Japan, China, Brazil, France, Singapore and Australia.
Our international operations may be affected by economic, political and
governmental conditions in some of the countries where we have manufacturing
facilities or where our products are sold. In addition, changes in economic or
political conditions in any of the countries in which we operate could result in
unfavorable taxation policies, exchange rates, new or additional currency or
exchange controls, governmental regulations, credit risks, or other restrictions
being imposed on the operations of the Company or expropriation.

PATENTS AND PROPRIETARY TECHNIQUES

        We have a broad patent portfolio as well as other proprietary
information and manufacturing techniques and have applied, and will continue to
apply, for patents to protect our technology. The Company's success depends in
part upon our ability to protect our technology and proprietary products under
US and foreign patent and other intellectual property laws. Trade secrets and
confidential know-how which are not patented are protected through
confidentiality agreements, contractual provisions and internal Company
administrative procedures. There can be no assurance that such arrangements will
provide meaningful protection for the Company in the event of any unauthorized
use or disclosure. There can be no assurance that third parties will not assert
infringement claims against the Company or that a license or similar agreement
will be available on reasonable terms in the event of an unfavorable ruling on
any such claim. In addition, any such claim may require the Company to incur
litigation expenses or subject the Company to liabilities.

TECHNOLOGICAL AND REGULATORY CHANGE

        The filtration and separations industry is characterized by changing
technology, competitively imposed process standards and regulatory requirements,
each of which influences the demand for our products and services. Changes in
legislative, regulatory or industrial requirements or competitive technologies
may render certain of our filtration and separations products and processes
obsolete. Acceptance of new products may also be affected by the adoption of new
government regulations requiring stricter standards. The Company's ability to
anticipate changes in technology and regulatory standards and to develop and
introduce new and enhanced products successfully on a timely basis are
significant factors in our ability to grow and to remain competitive. Similar to
all companies, we are also subject to the risks generally associated with new
product introductions and applications, including lack of market acceptance,
delays in product development and failure of products to operate properly.

COMPETITION

        The filtration and separations markets in which we compete are highly
competitive. We compete with many domestic and international companies in the
global markets. The principal methods of competition in the markets in which we
compete are product specifications, performance, quality, knowledge, reputation,
technology, distribution capabilities, service and price.

INFLATION

        Inflation had a negligible effect on our operations. We estimate that
inflationary effects, in the aggregate, were generally recovered or offset
through increased pricing or cost reductions in all periods presented.

KEY CUSTOMERS AND SUPPLIERS

        We have multi-year contracts and arrangements in place with several of
our major customers and suppliers. These contracts and arrangements help us
effectively plan and manage our operations. Since the markets for our products
are dynamic, these contracts and arrangements are continually evolving as we are
sensitive to the changing needs of our customers and the ongoing performance of
our suppliers. There is no assurance, however, that these

                                       14


contracts and arrangements will be renewed, will not be terminated prematurely
or revised to take into consideration the evolving nature of our relationships
with our customers and suppliers.

CAUTION CONCERNING FORWARD-LOOKING STATEMENTS

        Because we want to provide shareholders with more meaningful and useful
information, this quarterly report contains statements relating to future events
and the predicted performance of CUNO Incorporated (the "Company", "CUNO", or
"we") which may constitute forward-looking statements, as defined under the
Private Securities Litigation Act. We have tried, wherever possible, to identify
these "forward looking" statements by using words such as "anticipate,"
"believe," "estimate," "expect" and similar expressions. These statements
reflect our current beliefs and are based on information currently available to
us. Accordingly, these statements are subject to risks and uncertainties which
could cause our actual results performance or achievements to differ materially
from those expressed in, or implied by, these statements. These risks and
uncertainties include the following: economic and political conditions in the
foreign countries in which we conduct a substantial part of our operations and
other risks associated with international operations including taxation
policies, credit risk, exchange rate fluctuations and the risk of expropriation;
our ability to protect our technology, proprietary products and manufacturing
techniques; volumes of shipments of our products, changes in our product mix and
product pricing; continuing beneficial relationships with customers; costs of
raw materials; the rate of economic and industry growth in the United States and
the other countries in which we conduct our business; changes in technology,
changes in legislative, regulatory or industrial requirements and risks
generally associated with new product introductions and applications; and
domestic and international competition in our global markets. We assume no
obligation to publicly release revisions to the forward-looking statements to
reflect new events or circumstances.

CRITICAL ACCOUNTING POLICIES

        The Securities and Exchange Commission ("SEC") defines the most critical
accounting policies as the ones that are most important to the portrayal of a
company's financial condition and operating results, and require management to
make its most difficult, subjective or complex judgments, often as a result of
the need to make estimates about the effect of matters that are inherently
uncertain. Based on this definition, our most critical accounting policies
include: revenue recognition, accounting for depreciation and amortization,
employee benefits, contingencies, allowance for doubtful accounts, income taxes,
and stock based compensation. The methods, estimates and judgments we use in
applying these most critical accounting policies have a significant impact on
the results we report in our financial statements. There were no changes in
accounting policies or significant changes in accounting estimates during the
current period. All of our critical accounting policies and significant
estimates have been discussed with the Audit Committee of the Board of
Directors. We have not made any significant changes to our critical accounting
policies or estimates since year end.

        Revenue Recognition -- We recognize revenue in accordance with SEC Staff
Accounting Bulletin No. 104 "Revenue Recognition" ("SAB 104"). SAB 104 requires
that four basic criteria be met before revenue can be recognized: 1) there is
evidence that an arrangement exists; 2) delivery has occurred; 3) the fee is
fixed or determinable; and 4) collectibility is reasonably assured. We recognize
revenue upon determination that all criteria for revenue recognition have been
met. Accordingly, revenue is recognized upon delivery to a common carrier when
terms are FOB shipping and upon receipt by customer when terms are FOB
destination.

        Depreciation and Amortization - We depreciate our property, plant and
equipment using the straight-line method over the estimated useful life of the
asset. These periods range as follows:

               Land improvements                10 - 20 years
               Buildings and additions          30 - 40 years
               Machinery and equipment           5 - 20 years
               Computers and related equipment   3 - 5 years

                                       15


        We amortize our patents and other amortizable intangible assets over
their estimated useful lives. The straight line method of amortization is used
unless another method is more appropriate and reliable in reflecting the pattern
in which the asset provides economic benefits. These periods generally range
from 10 - 20 years.

        We review the carrying values of intangibles and long-lived assets on an
annual basis. In addition, in the event that facts and circumstances indicate
that the carrying value of intangibles and long-lived assets or other assets may
be impaired at any other time, an evaluation is performed. Our evaluations
compare the estimated future undiscounted cash flows associated with the asset
to the asset's carrying amount.

        Employee Benefits - We account for our pension plans in accordance with
SFAS No. 87, "Employer's Accounting for Pensions". In applying this accounting
practice, assumptions are made regarding the valuation of benefit obligations
and the performance of plan assets.

The primary assumptions are as follows:

      -     Weighted average discount rate - this rate is used to estimate the
            current value of future benefits. This rate is adjusted based on
            movements in long-term interest rates.

      -     Expected long-term rate of return on assets - this rate is used to
            estimate future growth in investments and investment earnings. The
            expected return is based upon a combination of historical market
            performance and anticipated future returns for a portfolio
            reflecting the mix of equity, debt and other investments indicative
            of our plan assets.

      -     Rates of increase in compensation levels - this rate is used to
            estimate projected annual pay increases, which are used to determine
            the wage base used to project employees' pension benefits at
            retirement.

      We determine these assumptions based on consultations with our outside
actuaries and investment advisors. Any variance in the above assumptions could
have a significant impact on future recognized pension costs, assets and
obligations.

      Business Acquisitions - Assets and liabilities acquired in a business
combination are recorded at their estimated fair values at the acquisition date.
In accordance with SFAS 142, goodwill and intangible assets deemed to have
indefinite lives are not amortized but are subject to annual impairment testing.
The assessment of goodwill involves the estimation of the fair value of
reporting units, as defined by SFAS 142. Management completed this annual
assessment during the fourth quarter of 2004 based on the best information
available as of the date of the assessment, which incorporated management's
assumptions about expected future cash flows. Based on this assessment, there
was no goodwill impairment in 2004. Future cash flows can be affected by changes
in the global economy and local economies, industries and markets in which the
Company sells products or services, and the execution of management's plans,
particularly with respect to integrating acquired companies. There can be no
assurance that future events will not result in impairment of goodwill or other
intangible assets.

      Contingencies, Claims and Assessments -- From time to time, we are
involved with contingencies, claims, and assessments. We use both in-house and
outside legal counsel to assess the probability of loss. The Company establishes
an accrual for specific contingencies, claims and assessments when both of the
following conditions are present: a loss is deemed probable and the amount of
the anticipated loss can be reasonably estimated. There can be no assurance that
the ultimate resolution of these contingencies, claims, and assessments will not
differ materially from our estimates.

      Allowance for Bad Debts -- The allowance for doubtful accounts is
established to represent our best estimate of the net realizable value of the
outstanding accounts receivable balances. We estimate our allowance for doubtful
accounts based on past due amounts and historical write-off experience, as well
as trends and factors surrounding the credit risk of specific customers. In an
effort to identify adverse trends, we perform periodic credit

                                       16


evaluations of our customers and ongoing account balance reviews and agings of
receivables. Amounts are considered past due when payment has not been received
within the time frame of the credit terms extended. Write-offs are charged
directly against the allowance for doubtful accounts and occur only after all
collection efforts have been exhausted. Actual write-offs and adjustments could
differ from the allowance estimates due to unanticipated changes in the business
environment as well as factors and risks surrounding specific customers.

      Income Taxes - We estimate and use our expected annual effective income
tax rate to accrue income taxes on an interim basis. We update these estimates
quarterly. We record valuation allowances to reduce our deferred income tax
assets to an amount that we believe is more likely than not to be realized. We
consider estimated future taxable income and ongoing prudent and feasible tax
planning strategies in assessing the need for a valuation allowance. If we were
to determine that we will not realize all or part of our deferred income tax
assets in the future, we would make an adjustment to the carrying value of the
deferred income tax asset, which would be reflected as an income tax expense.
Conversely, if we were to determine that we will realize a deferred income tax
asset, which currently has a valuation allowance, we would reverse the valuation
allowance which would be reflected as an income tax benefit in our financial
statements.

      We take tax positions in our worldwide corporate income tax filings based
on careful interpretations of global statutes, rules, regulations and court
decisions that may be applied and interpreted differently by various taxing
jurisdictions. These taxing jurisdictions may or may not challenge our
application and interpretation of a wide body of tax jurisprudence. However, we
do not anticipate that any sustained challenge by any taxing jurisdiction will
have a material adverse effect on our financial position or net income.

      Stock Based Compensation - We currently account for our stock option
awards under the recognition and measurement principles of APB Opinion No. 25,
"Accounting for Stock Issued to Employees", and related interpretations. No
stock-based employee compensation cost pertaining to stock options is reflected
in net income, as all options granted under our plans had exercise prices equal
to the market value of the underlying common stock on the date of grant.
Restricted and performance share grants awarded to employees are included in
earnings as an expense over the vesting period of the award. The Company expects
to adopt SFAS No. 123 (revised), "Share Based Payment" in the first quarter of
2006. SFAS No. 123(R) will require the recognition of compensation expense
associated with the share-based payment in the Company's consolidated financial
statements, and is expected to have a material impact on the Company's results
of operations.

                                       17


RESULTS OF OPERATIONS

THREE MONTH PERIOD ENDED APRIL 30, 2005 VS. THREE MONTH PERIOD ENDED APRIL 30,
2004

OVERVIEW

      During the second quarter of fiscal 2005, CUNO's sales grew by 26.6
percent. Sales growth was particularly strong in North America, Japan and
Asia/Pacific, and strong overall within the worldwide potable water market. U.S.
Dollar organic sales growth was 14.9 percent and organic sales growth on a local
currency basis was 12.4 percent. Although our sales increased significantly, our
gross margin decreased due primarily to the impact of our recent acquisition of
WTC Industries Inc. (WTC). Sales to retailers within the potable water market
and sales attributable to WTC generally carry lower gross margins than we have
historically reported. Net income was flat - we incurred approximately $0.5
million in operating costs associated with a new plant in Mexico and incurred
approximately $0.8 million in costs associated with compliance efforts
surrounding the Sarbanes-Oxley Act of 2002 which adversely affected
profitability.

      Going forward, business and market uncertainties may affect results. See
"Company Risk Factors" above and Management's Discussion and Analysis in our
Annual Report on Form 10-K for the fiscal year ended October 31, 2004 for a full
discussion of the key factors which affect our business and operating results.

      Below is a summary of selected consolidated earnings information:



                                          THREE MONTHS ENDED
                                               APRIL 30,
                                          2005          2004         CHANGE
                                          ----          ----         ------
                                                            
Net sales                               $104,725      $ 82,745        26.6%
Cost of products sold                     59,970        43,676        37.3%
Gross profit                              44,755        39,069        14.6%
        Gross margin percent                42.7%         47.2%       (450 bpt)

Selling, general and administrative       26,298        22,434        17.2%
        SG&A as a percent of sales          25.1%         27.1%       (200 bpt)

Operating income                          12,650        12,523         1.0%
        Operating margin                    12.1%         15.1%       (300 bpt)
        Effective tax rate                  32.2%         33.3%       (110 bpt)

Net income                              $  8,428      $  8,444        (0.2%)
Diluted earnings per share              $   0.48      $   0.49        (2.0%)


BUSINESS ENVIRONMENT

      Our geographic and market diversity help limit the impact of any one
market or the economy of any single country on our consolidated results. The
uncertainty of the economic conditions in various markets and geographic regions
in which we compete is likely to continue to present challenges to our business
near term. The U.S. Dollar was significantly weaker compared to most of the
currencies in countries we conduct business in during the second quarter of 2005
compared to the second quarter of 2004. We translate revenue and expense
accounts at the average exchange rates during the periods presented.

NET SALES

      Net sales were $104.7 million in the second quarter of fiscal 2005
representing a 26.6 percent increase over 2004's second quarter sales of $82.7
million. This increase can generally be attributed to an increase in the unit
volume of worldwide sales. Had currency values been unchanged from the second
quarter of 2004, net sales in the

                                       18


second quarter of 2005 would have been $2.1 million lower than the reported
sales of $104.7 million, or 24.1 percent greater overall.

      The following table displays the Company's sales by geographic segment:



                              THREE MONTHS ENDED                  CURRENCY
                                   APRIL 30,            PERCENT   ADJUSTED
                               2005         2004        CHANGE     CHANGE
                             --------     --------      ------     ------
                                                      
North America                $ 56,876     $ 41,989       35.5%     35.5%
Europe                         17,950       16,100       11.5%      4.9%
Japan                          12,894       11,135       15.8%     13.9%
Asia/Pacific                   13,073       10,310       26.8%     23.1%
Latin America                   3,932        3,211       22.5%     10.4%
                             --------     --------
             Total sales     $104,725     $ 82,745       26.6%     24.1%
                             ========     ========


      North American sales increased 35.5 percent in the second quarter of 2005
as compared to the same quarter in 2004. Sales increased in all North American
markets during the quarter, however stronger potable water market sales were
largely responsible for this growth. Excluding sales from WTC which we acquired
on August 2, 2004, sales in North America would have been up 12.6 percent
quarter over quarter. North American fluid processing and healthcare sales
increased 8.4 percent and 9.1 percent, respectively, reflecting the overall
strength of the economy during this time period. European sales increased 4.9
percent in local currency as compared to the same period in 2004. Sales were
generally strong in all European markets, however fluid processing sales were
particularly strong in the quarter reflecting greater demand for our products
serving the industrial and chemical markets. Sales in Japan were up broadly in
all markets and were led by very strong sales of food and beverage filters used
in the healthcare market primarily for the filtration of bottled drinks.
Asia/Pacific sales were up 23.1 percent in local currency primarily reflecting
strong growth of potable water sales within the Asia region. Second quarter 2005
Latin American sales were up 10.4 percent when expressed in local currency due
primarily to increased sales within the potable water and fluid processing
markets.

      The following table displays the Company's sales by market:



                              THREE MONTHS ENDED                  CURRENCY
                                    APRIL 30,           PERCENT   ADJUSTED
                               2005         2004        CHANGE     CHANGE
                             --------     --------      ------    --------
                                                      
Potable Water                $ 53,975     $ 37,940       42.3%     40.9%
Healthcare                     26,418       23,662       11.6%      8.0%
Fluid Processing               24,332       21,143       15.1%     11.7%
                             --------     --------
             Total sales     $104,725     $ 82,745       26.6%     24.1%
                             ========     ========


      The strength in the potable water market continues to be broad
geographically, driven largely by strong sales growth in North America (up 47.6
percent) associated with OEM customers, direct marketing companies and appliance
manufacturers and strong overseas sales (up 19.7 percent in local currency).
Excluding the impact of WTC, second quarter worldwide potable water sales were
up 18.3 percent on a local currency basis. Fluid Processing sales were up 8.4
percent in North America and up 13.2 percent overseas on a local currency basis.
Healthcare sales were up 9.1 percent in North America and up 7.6 percent
overseas on a local currency basis. Much of this overseas growth was driven by
continued strong sales of food and beverage filters in Japan used primarily for
the filtration of bottled drinks.

                                       19


GROSS PROFIT

      Gross profit increased $5.7 million to $44.8 million in the second quarter
of 2005 from $39.1 million in the second quarter of 2004. Gross profit as a
percentage of net sales (gross margin) decreased during that same period from
47.2 percent in 2004 to 42.7 percent in 2005. This decrease in gross margin is
primarily attributable to a change in our sales mix in the potable water market,
including sales of WTC (which we acquired on August 2, 2004 and are included in
our 2005 results) and increasing sales to retailers, both of which carry
comparatively lower gross margins.

OPERATING EXPENSES

      Selling, general and administrative expenses (SG&A) were up 17.2 percent,
less than the 26.6 percent sales growth rate for the quarter. Because of CUNO's
international operations, the weaker US dollar served to increase the
consolidated US dollar reported SG&A expense. SG&A expenses were 25.1 percent of
sales in the second quarter of fiscal 2005 vs. 27.1 percent of sales in the
second quarter of fiscal 2004. We continue to face rising structural costs such
as Sarbanes/Oxley compliance, medical, pension and depreciation expense, as well
as the addition of WTC's expenses included in 2005 results.

      Research, development and engineering expenses (incurred primarily in the
US and to a lesser extent in Europe) increased 27.8 percent to $5.2 million in
the second quarter of 2005, reflecting our continued focus on the development of
new products and technologies. As a percentage of sales, research, development
and engineering expenses were 4.9 percent of sales in both the second quarter of
fiscal 2005 and 2004.

OPERATING INCOME

      As a result of the above, operating income increased 1.0 percent, to $12.7
million or 12.1 percent of sales in the second quarter of fiscal 2005 compared
to $12.5 million or 15.1 percent of sales in the second quarter of 2004.

      Our operating income by segment is detailed below:



                       THREE MONTHS ENDED
                            APRIL 30,          DOLLAR       PERCENT
                        2005        2004       CHANGE       CHANGE
                      -------     -------      ------      ---------
                                               
OPERATING INCOME:
North America         $ 5,791     $ 6,917     ($1,126)      (16.3%)
Europe                  1,878       1,948         (70)       (3.6%)
Japan                   2,121       1,448         673        46.5%
Asia/Pacific            2,403       1,879         524        27.9%
Latin America             457         331         126        38.1%
                      -------     -------     -------
          Total       $12,650     $12,523         127         1.0%
                      =======     =======     =======


      Operating income in North America decreased by $1.1 million, or 16.3
percent. This decrease was due to many factors, including: operating costs of
approximately $0.5 million associated with a new plant which is currently being
built in Mexico to begin production of certain water products, compliance costs
of approximately $0.8 million associated with the Sarbanes Oxley Act,
amortization expense associated with WTC's definite lived amortizable intangible
assets ($0.5 million), lower gross margins associated with the change in sales
mix within the potable water market (as noted above) and other increased
structural costs discussed above.

      The results of our foreign operations are heavily dependent on the
relationship of their functional currency compared to the U.S. Dollar. We
translate our foreign revenue and expense accounts into U.S. Dollars using the
average exchange rate for the period. European sales increased 4.9 percent on a
local currency basis, while the Euro

                                       20


strengthened approximately 6 percent (average second quarter of 2005 versus
average second quarter of 2004). Increased manufacturing and structural costs
were responsible for the reduction in Europe's operating income. Sales in Japan
were up 13.9 percent on a local currency basis (and up $1.8 million in U.S.
dollars), and the Yen strengthened versus the U.S. Dollar approximately 2
percent quarter over quarter (allowing fixed costs to be spread over a larger
sales base). Sales in 2005 were very strong for food and beverage filters used
in the filtration of summer bottled drinks. These sales are dependent on
consumer preferences and other external factors. Asia/Pacific sales were up 23.1
percent quarter over quarter, and the Australian Dollar strengthened
approximately 3 percent in comparison (approximately 50 percent of our sales in
the region are denominated in Australian Dollars). Local currency sales in Latin
America increased 10.4 percent, contributing to the increase in operating income
for the quarter.

NONOPERATING INCOME (EXPENSE):

      Interest expense increased from $0.1 million in the second quarter of 2004
to $0.6 million in the second quarter of 2005. This primarily relates to
interest expense associated with our variable rate, unsecured revolving credit
facility. We had $68 million in outstanding borrowings under this facility at
April 30, 2005 and capitalized approximately $0.2 million in interest costs
during the second quarter of 2005 in accordance with the provisions of FAS 34,
"Capitalization of Interest Cost".

INCOME TAXES

      The Company's effective income tax rate for the second quarter of 2005 was
32.2 percent compared to 33.3 percent in the second quarter of 2004. Our tax
rate is impacted by the change in the mix of income attributed to the various
countries in which we do business and various one-time and recurring tax
planning initiatives.

      As of April 30, 2005, the Company had a full valuation allowance against
approximately $1.3 million of NOLs in China. Our China operations are start-up
in nature with a history of losses (no profit has been earned since inception in
2001). The remaining countries in which we carry valuation allowances against
NOLs are generally operations which are new to CUNO, have a history of losses,
or are in volatile economic regions of the world.

SIX MONTH PERIOD ENDED APRIL 30, 2005 VS. SIX MONTH PERIOD ENDED APRIL 30, 2004

OVERVIEW

      During the first six months of fiscal 2005, CUNO's sales were up 29.1
percent. This growth was favorably impacted by the overall weakness of the U.S.
Dollar, strong sales in the North American potable water market (up 52.6
percent) and overseas sales in general (up 12.5 percent in local currency). U.S.
Dollar organic sales growth was 17.3 percent and organic sales growth on a local
currency basis was 14.6 percent. Although our sales increased significantly, our
gross margin decreased due primarily to the impact of our recent acquisition of
WTC Industries Inc. (WTC). Sales to retailers within the potable water market
and sales attributable to WTC generally carry lower gross margins than we have
historically reported. Net income increased modestly (up 5.2 percent) - we
incurred approximately $0.7 million in operating costs associated with a new
plant in Mexico and incurred approximately $0.9 million in costs associated with
compliance efforts surrounding the Sarbanes-Oxley Act of 2002 which adversely
affected profitability.

      Going forward, business and market uncertainties may affect results. See
"Company Risk Factors" above and Management's Discussion and Analysis in our
Annual Report on Form 10-K for the fiscal year ended October 31, 2004 for a full
discussion of the key factors which affect our business and operating results.

      Below is a summary of selected consolidated earnings information:

                                       21




                                           SIX MONTHS ENDED
                                               APRIL 30,
                                          2005          2004        CHANGE
                                          ----          ----        ------
                                                           
Net sales                               $204,101      $158,154        29.1%
Cost of products sold                    116,900        84,229        38.8%
Gross profit                              87,201        73,925        18.0%
        Gross margin percent                42.7%         46.7%       (400 bpt)

Selling, general and administrative       50,962        42,604        19.6%
        SG&A as a percent of sales          25.0%         26.9%       (190 bpt)

Operating income                          24,855        22,952         8.3%
        Operating margin                    12.2%         14.5%       (230 bpt)
        Effective tax rate                  33.2%         33.3%        (10 bpt)

Net income                              $ 16,259      $ 15,449         5.2%
Diluted earnings per share              $   0.93      $   0.90         3.3%


BUSINESS ENVIRONMENT

      Our geographic and market diversity helps limit the impact of any one
market or the economy of any single country on our consolidated results. The
uncertainty of the economic conditions in various markets and geographic regions
in which we compete is likely to continue to present challenges to our business
near term. The U.S. Dollar was significantly weaker compared to most of the
currencies in countries we conduct business in during the first six months of
2005 compared to the first six months of 2004. We translate revenue and expense
accounts at the average exchange rates during the periods presented.

NET SALES

      Net sales were $204.1 million in the first six months of fiscal 2005
representing a 29.1 percent increase over 2004's sales of $158.2 million. This
increase can generally be attributed to an increase in the unit volume of
worldwide sales. Had currency values been unchanged from the first six months of
2004, net sales in the first six months of 2004 would have been $4.2 million
lower than the reported sales of $204.1 million, or 26.4 percent greater
overall.

      The following table displays the Company's sales by geographic segment:



                               SIX MONTHS ENDED                   CURRENCY
                                    APRIL 30,          PERCENT    ADJUSTED
                               2005         2004        CHANGE     CHANGE
                             --------     --------     -------    -------
                                                      
North America                $112,938     $ 80,925       39.6%     39.6%
Europe                         34,282       29,957       14.4%      7.1%
Japan                          24,934       20,729       20.3%     17.2%
Asia/Pacific                   24,732       20,091       23.1%     19.0%
Latin America                   7,215        6,452       11.8%      3.1%
                             --------     --------
             Total sales     $204,101     $158,154       29.1%     26.4%
                             ========     ========


                                       22


      North American sales increased 39.6 percent in the first six months of
2005 as compared to the same period in 2004. Stronger potable water market sales
were responsible for the growth in North America during this time period.
Potable water continues to achieve strong sales of its series of filters
designed for customers who serve various channels of distribution with final
sales to US residential consumers. North American fluid processing and
healthcare sales increased 10.8 percent and 9.4 percent, respectively. European
sales increased 7.1 percent in local currency as compared to the same period in
2004. Fluid processing sales were particularly strong in the period reflecting
greater demand for our products serving the industrial markets. Sales in Japan
were up 17.2 percent in local currency led by a strong increase in sales to the
healthcare market, and to a lesser extent the potable water market. Asia/Pacific
sales were up 19.0 percent excluding changes in currency values. Sales were very
strong throughout Asia, and particularly strong in the water markets in Asia.
First half 2005 Latin American sales were up 3.1 percent when expressed in local
currency.

      The following table displays the Company's sales by market:



                               SIX MONTHS ENDED                  CURRENCY
                                    APRIL 30,          PERCENT   ADJUSTED
                               2005         2004        CHANGE    CHANGE
                             --------     --------      ------    ------
                                                     
Potable Water                $106,272     $ 72,793       46.0%     44.7%
Healthcare                     50,258       43,948       14.4%     10.3%
Fluid Processing               47,571       41,413       14.9%     11.2%
                             --------     --------
             Total sales     $204,101     $158,154       29.1%     26.4%
                             ========     ========


      The strength in the potable water market was broad geographically, driven
largely by strong overseas sales (up 18.2 percent in local currency) and strong
sales growth in North America (up 52.6 percent) associated with OEM customers,
direct marketing companies, and appliance manufacturers. Fluid Processing sales
were up 10.8 percent in the U.S. and up 11.4 percent overseas on a local
currency basis. Healthcare sales were up 10.6 percent overseas on a local
currency basis and up 9.4 percent in the U.S. despite a reduction in diagnostic
sales.

GROSS PROFIT

      Gross profit increased $13.3 million to $87.2 million in the first six
months of 2005 from $73.9 million in the first six months of 2004. Gross profit
as a percentage of net sales (gross margin) decreased during that same period
from 46.7 percent in 2004 to 42.7 percent in 2005. This decrease in gross margin
is primarily attributable to a change in our sales mix in the potable water
market, including sales of WTC (which we acquired on August 2, 2004 and are
included in our 2005 results) and increasing sales to retailers, both of which
carry comparatively lower gross margins.

OPERATING EXPENSES

      Selling, general and administrative expenses (SG&A) were up 19.6 percent,
less than the 29.1 percent sales growth rate. Because of CUNO's international
operations, the weaker U.S. dollar served to increase the consolidated U.S.
dollar reported SG&A expense. SG&A expenses were 26.9 percent of sales in the
first six months of 2004 compared to 25.0 percent of sales in the first six
months of 2005. In addition, rising structural costs (such as Sarbanes/Oxley
compliance, medical, pension, insurance and depreciation expenses) impacted
overall SG&A expenses.

      Research, development and engineering expenses (incurred primarily in the
US and to a lesser extent in Europe) increased 22.6 percent to $10.1 million in
the first six months of 2005, reflecting our continued focus on the development
of new products and technologies. As a percentage of sales, RD&E expenses were
4.9 percent of sales in the first six months of fiscal 2005 compared to 5.2
percent of sales in the first six months of fiscal 2004.

                                       23


OPERATING INCOME

      As a result of the above, operating income increased $1.9 million, or 8.3
percent, to $24.9 million or 12.2 percent of sales in the first six months of
fiscal 2005 compared to $23.0 million or 14.5 percent of sales in the first six
months of 2004.

      Our operating income by segment is detailed below:



                      SIX MONTHS ENDED
                           APRIL 30,        DOLLAR        PERCENT
                      2005        2004      CHANGE        CHANGE
                    -------     -------     -------       -------
                                              
OPERATING INCOME:
North America       $12,126     $13,077     ($  951)       (7.3%)
Europe                2,914       3,073        (159)       (5.2%)
Japan                 4,474       2,506       1,968        78.5%
Asia/Pacific          4,564       3,612         952        26.4%
Latin America           777         684          93        13.6%
                    -------     -------     -------
          Total     $24,855     $22,952      $1,903         8.3%
                    =======     =======     =======


      Operating income in North America decreased by $1.0 million, or 7.3
percent. This decrease was due to many factors, including: operating costs of
approximately $0.7 million associated with a new plant which is currently being
built in Mexico to begin production of certain water products, compliance costs
of approximately $0.9 million associated with in Sarbanes/Oxley, amortization
expense associated with WTC's definite lived amortizable intangible assets ($0.9
million), lower gross margins associated with the change in sales mix within the
potable water market (as noted above) and other increased structural costs
discussed above.

      The results of our foreign operations are heavily dependent on the
relationship of their functional currency compared to the U.S. Dollar. We
translate our foreign revenue and expense accounts into U.S. Dollars using the
average exchange rate for the period. European sales increased 7.1 percent on a
local currency basis, while the Euro strengthened approximately 7 percent
(average first half of 2005 versus average first half of 2004) - these factors
helped to offset increased manufacturing and structural costs in Europe. Sales
in Japan were up 17.2 percent on a local currency basis, and the Yen
strengthened versus the U.S. Dollar approximately 3 percent period over period.
Asia/Pacific sales were up 19.0 percent on a local currency basis, and the
Australian Dollar strengthened approximately 3 percent in comparison
(approximately 50 percent of our sales in the region are denominated in
Australian Dollars). Local currency sales in Latin America increased 3.1
percent, contributing to the modest increase in operating income.

FINANCIAL POSITION AND LIQUIDITY

      We assess liquidity in terms of the Company's ability to generate cash to
fund our operating and investing activities. Of particular importance to the
management of liquidity are cash flows generated by operating activities,
capital expenditure levels, and adequate bank financing alternatives.

      We manage our worldwide cash requirements considering the cost
effectiveness of the funds available from the many subsidiaries through which we
conduct our business. We believe that our existing cash and cash equivalents
position ($20.7 million at April 30, 2005) and available sources of liquidity
(approximately $25 million of available, uncommitted, unused worldwide
short-term lines of credit) are sufficient to meet current and anticipated
requirements for the foreseeable future. We do not rely on commercial paper or
off-balance sheet financing arrangements for our liquidity needs nor do we have
any investments in special purpose entities ("SPEs"), or variable interest
entities ("VIEs").

                                       24


      We continue to invest in R&D to provide future sources of revenue through
the development of new products, as well as through additional uses for existing
products. Our efforts are spread across the various markets in which we compete,
with particular emphasis on new products and technologies in Healthcare and the
improvement in design and function of products within Potable Water. We consider
R&D and the development of new products and technologies an integral part of our
growth strategy and a core competence of the Company.

      Likewise, we continue to invest in capital expenditures in order to expand
and modernize manufacturing facilities around the globe. We are currently in the
process of establishing a manufacturing operation in Mexico to meet product
demands in the water market. In addition, new manufacturing lines and processes
are being installed in the US to benefit the potable water, fluid processing,
and healthcare markets.

      SUMMARY OF CASH FLOWS FOLLOWS:



                                                        SIX MONTHS ENDED
                                                            APRIL 30,
                                                       2005          2004
                                                       ----          ----
                                                             
CASH PROVIDED BY (USED FOR):
Operating activities                                 $ 16,256      $  8,878
Investing activities                                  (14,544)       (9,671)
Financing activities                                   (4,873)        2,181
Effect of exchange rate changes on cash and cash
equivalents                                               519           746


Net cash provided by operating activities increased by $7,378 due primarily to:

      -     Increase in deferred income taxes of $3,457

      -     Decrease in the use of cash for accounts receivable of $7,295

      -     Decrease in the use of cash for inventories of $2,801

      -     Increase in the use of cash for accounts payable and accrued
            expenses of $5,493

Net cash used for investing activities increased by $4,873 due primarily to:

      -     Decrease in cash paid for acquisitions of $554

      -     Increase in capital expenditures of $5,409

Net cash used for financing activities increased by $7,054 due primarily to:

      -     Increase of $6,302 in the paydown of long term debt in 2005

      -     Increase of $415 in proceeds from stock option exercises in 2005

The effect of exchange rate changes on cash and cash equivalents of $519 in 2005
reflects the continued weakening of the U.S. Dollar against the Japanese Yen,
Euro and Australian Dollar.

Contractual Obligations and Commercial Commitments

      Below is a table detailing, by maturity date, our Contractual Obligations
and Commercial Commitments as of October 31, 2004:

                                       25




OBLIGATIONS AND
COMMITMENTS            2005        2006        2007        2008       2009     THEREAFTER
- ---------------      -------     -------     -------     -------     -------   ----------
                                                             
Bank loans           $11,048     $    --     $    --     $    --     $    --     $    --
Long-term debt           276         242         119          28      75,011         169
Operating leases       3,436       2,904       2,479       1,852       1,700         253
                     -------     -------     -------     -------     -------     -------
         Total       $14,760     $ 3,146     $ 2,598     $ 1,880     $76,711     $   422
                     =======     =======     =======     =======     =======     =======


      Also, see fiscal 2005 changes in bank loans and long-term debt detailed on
the Consolidated Statements of Cash Flows for the six months ended April 30,
2005. We had no material qualifying long-term purchase obligations at October
31, 2004 and through the interim period in 2005. Our U.S. pension plans require
no minimum amount of funding in 2005, however we plan to contribute
approximately $3.3 million to our U.S. and Japanese pension plan in fiscal 2005.

OTHER INFORMATION

            Section 404 of the Sarbanes-Oxley Act of 2002 (the "Act") will
require the Company to include an internal control report from management in its
Annual Report on Form 10-K for the year ended October 31, 2005 and in subsequent
reports. The internal control report must include the following: (1) a statement
of management's responsibility for establishing and maintaining adequate
internal control over financial reporting, (2) a statement identifying the
framework used by management to conduct the required evaluation of the
effectiveness of the Company's internal control over financial reporting, (3)
management's assessment of the effectiveness of the Company's internal control
over financial reporting as of October 31, 2005, including a statement as to
whether or not internal control over financial reporting is effective, and (4) a
statement that the Company's independent auditors have issued an attestation
report on management's assessment of internal controls over financial reporting.

            Management acknowledges its responsibility for establishing and
maintaining internal controls over financial reporting and seeks to continually
improve those controls. In addition, in order to achieve compliance with Section
404 of the Act within the required time frame, the Company has been conducting a
process to document and evaluate its internal controls over financial reporting.
In this regard, the Company has dedicated internal resources, engaged outside
consultants and adopted a detailed work plan to: (1) assess and document the
adequacy of internal controls over financial reporting; (2) take steps to
improve control processes where required; (3) validate through testing that
controls are functioning as designed; and (4) implement a continuous reporting
and improvement process for internal control over financial reporting. The
Company believes its process for documenting, evaluating and monitoring its
internal control over financial reporting is consistent with the objectives of
Section 404 of the Act.

            Given the risks inherent in the design and operation of internal
controls over financial reporting, the Company can provide no assurance as to
its, or its independent auditor's, conclusions at October 31, 2005 with respect
to the effectiveness of its internal controls over financial reporting.

ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

      The overall objective of our financial risk management program is to seek
a reduction in the potential negative earnings effects from changes in foreign
exchange and interest rates arising from business activities. We manage these
financial exposures through operational means and by utilizing available
financial instruments. Practices may change as economic conditions change.

Foreign Currency Risk

      Our earnings and cash flows are subject to fluctuations due to changes in
foreign currency exchange rates. We utilize forward foreign exchange contracts
to hedge specific exposures relating to intercompany payments, certain firm
sales commitments and anticipated, but not yet committed, intercompany sales
(primarily parent

                                       26


company export sales to subsidiaries at pre-established US dollar prices) and
other specific and identified exposures. The terms of the forward foreign
exchange contracts are generally matched to the underlying transaction being
hedged, and are typically under one year.

      Because such contracts are directly associated with identified
transactions, they are an effective hedge against fluctuations in the value of
the foreign currency underlying the transaction. All of our foreign exchange
contracts are accounted for at fair value based on readily available market
price quotations. We generally do not hedge overseas sales denominated in
foreign currencies or translation exposures. Further, we do not enter into
financial instruments for speculation or trading purposes.

      We utilize bank loans and other debt instruments throughout our worldwide
operations. To mitigate foreign currency risk, such debt is generally
denominated in the underlying local currency of the affiliate. In certain
limited and specific circumstances, we will manage risk by denominating a
portion of debt outstanding in a currency other than the local currency.

ITEM 4. CONTROLS AND PROCEDURES

    (a) Our Chief Executive Officer and Chief Financial Officer performed an
evaluation of our disclosure controls and procedures as of April 30, 2005 (the
"Evaluation Date"). Based on that evaluation, our Chief Executive Officer and
Chief Financial Officer concluded that our disclosure controls and procedures
were effective and sufficient to ensure that the information required to be
disclosed in the reports that we file under the Securities Exchange Act of 1934
is recorded, processed, summarized, and reported within the time periods
specified in the SEC's rules and forms.

    (b) There have been no significant changes in our internal controls since
the Evaluation Date. We are not aware of any significant change in any other
factors that could significantly affect our internal controls subsequent to the
Evaluation Date.

                                       27


PART II

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

(a)   We held our annual meeting of Stockholders on March 3, 2005.

(b)   The following individuals were nominated and elected to serve a term of
      three years as Directors:
            Mr. C. Edward Midgley
            Mr. Frederick C. Flynn, Jr.

(c)   The stockholders voted on the following matters:

      1.    Election of Directors -- the voting results for each nominee, all of
            whom were reelected, are as follows:



         Name                      Votes For       Votes Withheld        Not Voted
         ----                      ---------       --------------        ---------
                                                                
Mr. C. Edward Midgley              15,400,602          181,573           1,604,362
Mr. Frederick C. Flynn, Jr.        14,440,700        1,141,475           1,604,362


      2.    A proposal for the reapproval of the performance goals in the
            Executive Management Incentive Plan was approved by a count of
            14,957,019 votes for, 584,472 votes against, 40,684 votes
            abstaining, and 1,604,362 shares not voted.

      3.    A proposal for the appointment of PricewaterhouseCoopers LLP as
            independent auditors was approved by a count of 15,481,179 votes
            for, 85,472 votes against, 15,524 votes abstaining, 1,604,362 shares
            not voted.

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

(a)   Documents filed as part of this report.

      Exhibit 31.1 - Certification of Mark G. Kachur pursuant to Section 302 of
      the Sarbanes-Oxley Act of 2002

      Exhibit 31.2 - Certification of Frederick C. Flynn, Jr. pursuant to
      Section 302 of the Sarbanes-Oxley Act of 2002

      Exhibit 32.1 - Certification Pursuant to 18 U.S.C. Section 1350, as
      Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

      Exhibit 32.2 - Certification Pursuant to 18 U.S.C. Section 1350, as
      Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

(b) Reports on Form 8-K

      We filed a Report on Form 8-K, dated February 23, 2005, under "Item 9.01
Financial Statements and Exhibits," reporting our financial results for the
quarter ended January 31, 2005.

                                       28


        We filed a Report on Form 8-K dated March 28, 2005, under "Item 1.01
    Entry into a material Definitive Agreement", disclosing a recent employment
    agreement with Mark G. Kachur and an amendment to Mark G. Kachur's
    Termination and Change in Control Agreement.

        We filed a report on Form 8-K dated May 11, 2005 under "Item 1.01 Entry
    into a Material Definitive Agreement" and "Item 3.03 Material Modification
    to Rights of Security Holders", disclosing an Agreement and Plan of Merger
    with 3M Company and an amendment to CUNO's Rights Agreement with the
    Compnay's transfer agent.

                                       29


                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

CUNO INCORPORATED

Date May 25, 2005

By /s/ Mark G. Kachur
   ------------------
Mark G. Kachur
Chairman of the Board of Directors,
President and Chief Executive Officer

By /s/ Frederick C. Flynn, Jr.
   ---------------------------
Frederick C. Flynn, Jr.
Senior Vice President -
Finance and Administration,
Chief Financial Officer and Assistant Secretary

                                       30