EXHIBIT 10.5 TAX ALLOCATION AGREEMENT TAX ALLOCATION AGREEMENT (the "Agreement") dated as of , 1996, between Commercial Intertech Corp, an Ohio corporation (CIC), and Cuno Incorporated, a Delaware Corporation (Cuno). WHEREAS, CIC is currently the common parent of an affiliated group of corporations (the "Old Company Group") within the meaning of Section 1502 of the Internal Revenue Code of 1986, as amended (the "Code") filing consolidated, combined or unitary income tax returns ("Consolidated Returns"), pursuant to which CIC and one or more other members of the Affiliated Group pay Taxes (as defined herein) on a consolidated basis ("Consolidated Taxes"); WHEREAS CIC will distribute the stock of Cuno to its shareholders ("Spin-Off"), in a transaction intended to qualify as a tax-free spin-off under Section 355 of the Code. WHEREAS, on the beginning of the first day after the date on which the Spin-Off occurs (the "Distribution Date"), Cuno and its subsidiaries (collectively, the "Cuno Group"), will cease to be members of the Old Company Group; WHEREAS, CIC and Cuno desire to allocate the liability for the Taxes of members of the Old Company Group for any Tax Period (including short Tax Periods and any portion of any Tax Period) which period (or portion) ends on or before the Distribution Date (a "Pre-Distribution Tax Period") among the members of the Old Company Group in a manner consistent with the tax allocation agreement and practices of the Old Company Group as in effect on the Distribution Date, and to provide for certain other tax-related matters; NOW, THEREFORE, in consideration of the mutual covenants contained herein, the parties hereto agree as follows. ARTICLE I CERTAIN DEFINITIONS The following terms used herein shall have the meanings set forth below (such terms to be equally applicable to the singular and plural forms of the terms defined or referred to below): 1.1 "Agreement" shall have the meaning set forth in the recitals to this Agreement. 1.2 "Code" shall have the meaning set forth in the recitals to this Agreement. 1.3 "CIC Group" means CIC and any subsidiaries which CIC continues to own following the Distribution that are eligible to join in a consolidated tax return with CIC, together with CIC. 1.4 "Consolidated Return" shall have the meaning set forth in the recitals to this Agreement. 1.5 "Consolidated Group" or "consolidated group" means an affiliated group of corporations filing a consolidated federal income tax return, as defined in Treasury Regulation Section 1.1502-1 (h). 1.6 "Distribution Date" shall have the meaning set forth in the recitals to this Agreement. 1.7 "Income Taxes" means any and all Taxes based upon or measured by net income (including, without limitation, any alternative minimum tax under Section 55 of the Code) imposed by or payable to the U.S., or any state, county, local or foreign government or any subdivision or agency thereof, and such term shall include any interest (whether paid or received), penalties or additions to tax attributable thereto. 1.8 "Income Tax Liabilities" means all liabilities for Income Taxes net of refunds, net of refunds including liabilities for Income Taxes assumed by a party pursuant to a contract. 1.9 "Indemnified Party" means the party that is entitled to indemnification by another party pursuant to this Agreement. 1.10 "Indemnifying Party" means the party that is required to indemnify another party pursuant to this Agreement. 1.11 "Independent Accounting Firm" means a "big six" independent accounting firm, jointly selected by the parties; or, if the parties cannot agree on such accounting firm, Cuno and CIC shall each submit the name of a "big six" independent accounting firm that does not at the time and has not in the prior two years provided services to any member of the Cuno Group or the CIC Group, and the "Independent Accounting Firm" shall mean the firm selected by lot from these two firms. 1.12 "Information Return" means any report, return, declaration or other information or filing (other than a Tax Return) required to be supplied to any taxing authority or jurisdiction. 1.13 "Cuno Group" shall have the meaning set forth in the recitals to this Agreement. 1.14 "Material Tax Election" means any election, change in annual accounting period, change or adoption of any accounting method, filing of any amended Tax Return, entering into any closing agreement, settlement of any Tax claim or Proceeding relating to any member of the Old Company Group or the Cuno Group, surrender of any right to claim a Refund, or consent to any extension or waiver of the limitation period applicable to any Tax claim or assessment. 1.15 "Old Company Group" shall have the meaning set forth in the recitals to this Agreement. 1.16 "Other Taxes" means all Taxes other than Income Taxes. 1.17 "Overpayment Rate" means the rate specified under Section 6621 (a) (1) of the Code for overpayments of tax. 1.18 "Post-Distribution Tax Period" means any Tax Period ending after the Distribution Date (other than "Pre-Distribution Tax Period" below). 1.19 "Pre-Distribution Tax Period" shall have the meaning set forth in the recitals to this Agreement. 1.20 "Proceeding" means any audit or other examination, judicial or administrative proceeding relating to liability for or refunds or adjustments with respect to Taxes. 1.21 "Property Taxes" shall have the meaning set forth in Section 3.2 (a) (I) of this Agreement. 1.22 "Refund" means any refund of Income Taxes or Other Taxes, including any reduction in liabilities for such taxes. 1.23 "Short Period" shall have the meaning set forth in Section 3.1 (a) of this Agreement. 1.24 "Spin-Off" shall have the meaning set forth in the recitals to this Agreement. 1.25 "Tax Period" means any twelve month period which constitutes the taxable year of a party hereto. 1.26 "Tax Return" means any report, return, declaration or other information or filing required to be supplied to any taxing authority or jurisdiction with respect to Income Taxes or Other Taxes, including, without limitation, any documents with respect to or accompanying payments of estimated Income Taxes or Other Taxes, or with respect to or accompanying requests for the extension of time in which to tile any such report, return, declaration or other document. 1.27 "Taxes" means any Income Taxes and all taxes, levies or other like assessments, charges or fees, including, without limitation, any excise, real or personal property, gains, sales, use, license, real estate or personal property transfer, net worth, stock transfer, payroll, ad valorem and other governmental taxes and any withholding obligation imposed by or payable to the U.S., or any state, county, local or foreign government or subdivision or agency thereof, and any interest (whether paid or received), penalties or additions to tax attributable thereto. 1.28 "Taxing Authorities" means any governmental authority which imposes, or is responsible for the imposition of a Tax. 1.29 "Transfer" means any transfer of assets by a member of the Old Company Group which occurs in contemplation of or to effectuate the Spinoff and which may give rise to deferred intercompany gain or gain pursuant to Code section 311(b). 1.30 "Distribution" shall mean the distribution of Cuno stock to the shareholders pursuant to the spin-off described in the Recitals to this Agreement. 1.31 "Transfer and Distribution Taxes" means any Taxes imposed or assessed against any member of the Old Company Group, the CIC Group or the Cuno Group, attributable to or occasioned by, the Transfer described in 1.29 and/or a Distribution described in 1.30 above. ARTICLE II TERMINATION OF PRIOR TAX SHARING AGREEMENTS Termination of Prior Tax Sharing Agreement. This AGREEMENT shall take effect on the Distribution Date and shall supersede all other agreements, whether or not written in respect of any Taxes between the Cuno Group and the CIC Group their respective predecessors or successors, except to the extent necessary to effectuate section 4.1 and section 5.1 of this Agreement with respect to the Cuno Group and the CIC Group. All such replaced agreements shall terminate as of the Distribution Date, and any rights or obligations created thereunder thereby shall be settled in the normal course. ARTICLE III RETURN PREPARATION, FILING AND PAYMENT OF TAXES 3.1 Control of Tax Matters. (a) Return Preparation and Filing. (i) Pre-Distribution Tax period. Cuno hereby irrevocably designates, and agrees to cause each of its subsidiaries to so designate, CIC as its agent to take any and all actions, necessary or incidental to the preparation of Consolidated Returns and the filing of such Consolidated Returns and claims for Refunds or forms relating to any Pre-Distribution Tax period. (ii) Short Period. For any Tax Period that begins prior to the Distribution Date and ends on the Distribution Date (a "Short Period") of CIC or any of its subsidiaries that was a member of the Old Company Group for any Pre-Distribution Tax Period, CIC will timely prepare and file (in a manner consistent with past practice of CIC, unless CIC reasonably determines that such practice is inconsistent with the then existing state of the law) with the appropriate Taxing Authorities all Consolidated Returns required to be filed for such Short Period. (iii) Separate Company Returns. Each Company that was a member of the Old Company Group shall be responsible for filing all of its Tax Returns for the Tax Period which includes the Distribution Date, other than any Consolidated Federal Income Tax Returns for Short Periods. 3.2 Cooperation and Record Retention. (a) CIC and Cuno agrees to cooperate fully, and will cause each of their subsidiaries to so cooperate, in a timely manner consistent with existing practice in filing any return or consent contemplated by this Agreement. CIC and Cuno also agree to take, and will cause the appropriate subsidiary to take, such action or actions as CIC or Cuno may reasonably request, including but not limited to the filing of requests for the extension of time within which to file Consolidated Returns, and to cooperate in connection with any refund claim with respect to any Pre-Distribution Tax Period. CIC and Cuno further agree to furnish timely, and to cause each of their subsidiaries to so furnish CIC or Cuno with any and all information reasonably requested in order to carry out the provision of this Agreement. Without limiting the generality of the foregoing sentence, CIC and Cuno specifically agree to provide each other promptly, but in any event within 10 days of receipt thereof, copies of any correspondence or notices received from the Internal Revenue Service of any other Taxing authority with respect to any Consolidated Return of the Old Company Group for a Pre-Distribution Tax Period. (b) CIC and Cuno shall cooperate fully, as and to the extent reasonably requested by the other party, in connection with any Proceeding. Such cooperation shall include the retention and (upon the other party's request) the provision of records and information which are reasonably relevant to any such Proceeding, and making employees available on a mutually convenient basis to provide additional information and explanation of any material provided hereunder. CIC and Cuno agree (i) to retain all books and records with respect to tax matters pertinent to the Old Company Group and the Cuno Group relating to any Pre-Distribution Tax Period, and to abide by all record retention agreements entered into with any Taxing Authority, and (ii) to give the other party reasonable written notice prior to destroying or discarding any such books and records and, if the other party so requests, CIC or Cuno as the case may be, shall allow the requesting party to take possession of such books and records. CIC and Cuno further acknowledge and agree that any such books and records necessary to establish the amount of any loss or tax credit carry forward shall be retained until the expiration of the statute of limitations in respect of the year in which such loss or tax credit carry foward are utilized to reduce taxable income, or tax. ARTICLE IV REFUNDS AND CONTESTS 4.1 Refunds of Income Taxes or Other Taxes. The Cuno Group shall be entitled to all Refunds attributable to the Cuno Group, and the CIC Group shall be entitled to all Refunds attributable to the CIC Group or the Old Company Group (other than those attributable to the Cuno Group). For this purpose, Refunds attributable to the Cuno Group shall mean Refunds determined pursuant to the prior tax sharing agreement and practices between CIC and Cuno. Refunds attributable to the Old Company Group shall mean Refunds determined pursuant to such tax sharing agreement and practices (other than those attributable to the Cuno Group). A party receiving a Refund to which another party is entitled pursuant to this Agreement shall pay the amount to which such other party is entitled within ten days after the receipt of the Refund. 4.2 Contests. (a) Except as provided below, in the event that any deficiencies or Refund claims arise with respect to an Income Tax Liability with respect to any Consolidated Return of the Old Company Group for a Pre-Distribution Tax Period except as provided below, CIC shall control all Proceedings with respect thereto. In the event that any issue or issues are raised during such Proceedings that may result, directly or indirectly, in deficiencies or refund claims related to Taxes that would be required to be paid by Cuno pursuant to this Agreement, both Cuno and CIC agree and acknowledge that the contest of any such issue or issues shall be conducted jointly. With respect to such joint contests, neither party shall have the right to accept or enter into the settlement of any Tax liability, or compromise any Tax claim to the extent such liability or claim relates to an item for which the other party has indemnity liability hereunder, without the prior written consent of the other party (which consent shall not be unreasonably withheld). CIC's right to indemnity hereunder shall be conditioned on compliance with this Agreement. CIC shall be required to give notice to Cuno upon the receipt of oral or written notice from any governmental authority or agent thereof of an issue that may result in Taxes for which a claim for indemnity from Cuno may be made, under this Agreement. Cuno agrees to pay its own expenses incurred in connection with its participation in any such Proceedings. (b) Cuno and CIC agree to cooperate in all reasonable respects with respect to Tax deficiencies or Refund claims described in Section 4.2 of this Agreement, which cooperation shall include executing and filing such waivers, consents, forms court petitions, refund claims, complaints, powers of attorney and other documents needed from time to time in order to defend, prosecute or resolve such deficiencies or claims. ARTICLE V INDEMNIFICATION FOR TAXES 5.1 Cuno Group and Cuno Group Income Taxes. The Cuno Group shall pay, and shall indemnify and hold the CIC Group harmless against (i) all Income Tax Liabilities of any member of the Cuno Group for all Tax Periods (Including Tax Periods or portions thereof during which any member of the Cuno Group was a member of the Old Company Group but excluding all Income Tax Liabilities arising from the Transfer and Distribution as provided for in Section 5.3 hereof) and (ii) all Income Tax Liabilities incurred pursuant to Treasury Regulation Section 1.1502-6 or any comparable state, local or other provision providing for several liabilities as a result of any member of the Cuno Group having been a member of any consolidated, combined, unitary or other group (other than the Old Company Group). For purposes of clause (i) of this section 5.1, the Income Tax Liabilities of any member or members of the Cuno Group for any Pre-Distribution Tax Period shall be determined pursuant to the prior tax sharing agreement and practices between CIC and Cuno. 5.2 CIC Group and CIC Group Income Taxes. The CIC Group shall pay, and shall indemnify and hold the Cuno Group harmless against, (i) all Income Tax Liabilities of any member of the Old Company Group (other than Income Tax Liabilities of any member of the Cuno Group for any Tax Period) but excluding all Income Tax Liabilities arising from the Transfer and Distribution as provided for in Section 5.3 hereof and (ii) all Income Tax Liabilities incurred pursuant to Treasury Regulation Section 1.1502-6 or any comparable state, local or other provision providing for several liabilities as a result of any member of the Old Company Group or the CIC Group (other than any member of the Cuno Group) having been a member of any other consolidated, combined, unitary or other group. For purposes of clause (i) of this section 5.2, the Income Tax Liabilities of any member or members of the Old Company Group for any Pre- Distribution Tax Period shall be determined pursuant to the prior tax sharing agreement and practices between CIC and Cuno. 5.3 Transfer and Distribution Taxes. (a) Cuno shall pay, indemnify and hold the CIC Group harmless from any Transfer and Distribution Taxes other than Income Taxes attributable to (i) the restoration of deferred intercompany gain under the United States consolidated income tax return regulations or (ii) recognition of gain pursuant to Code section 311(b). (b) Any Income Tax solely attributable to failure of Distribution to qualify under Section 355 (hereafter "Spin-Off Taxes") shall be allocated and apportioned as described in Sections 5(b)(i), (ii), and (iii) below. CIC and Cuno acknowledge and agree that in determining the proper amount of working capital required by each group after the Spin-Off, it is intended by the parties to have the Spin-Off qualify for tax-free treatment under Code sections 368(a)(1)(D) and 355 (i.e., a "Tax-Free Spin-Off"). Therefore, it is contemplated and agreed that neither CIC nor Cuno nor their respective shareholders will take any action that will cause the Spin-Off to fail to qualify for favorable tax treatment under Code sections 368(a)(1)(D) and 355 (i.e., a "Taxable Spin-Off). In the event that the Spin-Off is ultimately determined to be a Taxable Spin-Off, it is possible that CIC will incur Spin-Off Taxes, which taxes shall be allocated and apportioned as follows: (i) If the Spin-Off Taxes are incurred due to a change of control, the Group undergoing such change of control shall pay, indemnify and hold the other Group harmless from all Spin-Off Taxes. (ii) If the Spin-Off Taxes are incurred due to either CIC or Cuno breaching any of the representation or covenants with respect to the Spin-Off, any Spin-Off Taxes shall be paid by and the responsibility of the breaching party. (iii) If the Spin-Off Taxes are incurred for any reason other than (i) or (ii) above, Cuno and CIC will each pay, indemnify, and hold harmless the other party, for 50% of such taxes. Since it is contemplated by the parties that the working capital requirements of The Cuno Group and The CIC Group will be affected by the payment of any Spin-Off Taxes, and that such working capital would be apportioned differently if the Spin-Off Taxes were anticipated before the Spin-Off, it is agreed that any payment or indemnification made pursuant to this section relating to Spin-Off Taxes as well as other Transfer and Distribution Taxes, shall, for Income Tax purposes, relate back and be deemed to have been paid immediately prior to the Spin-Off. In the event that the Indemnified Party is required to pay Income Taxes on the receipt of indemnification for the Spin-Off Taxes, the Indemnifying Party shall further compensate the Indemnified Party by making an additional payment (i.e., a "Gross-up Payment") equal to the Income Tax on the sum of (A) the indemnification for the Spin-Off Taxes and (B) the Gross-up Payment, such that the Indemnified Party will be made whole on an after tax basis for the amounts received pursuant to this Section 5. For purposes of calculating the required Gross-up payment, the highest United States federal marginal income tax rate in the year of payment plus 4% shall be used. 5.4 Other Taxes. (a) The CIC Group shall pay, and shall indemnify and hold the Cuno Group harmless against, all liabilities for all Other Taxes attributable to the income, property or activities of any member of the Old Company Group or the CIC Group (other than, in both cases, a member of the Cuno Group). Except as provided in the preceding sentence, the Cuno Group shall pay, and shall indemnify and hold the CIC Group harmless against, all liabilities for all Other Taxes attributable to the income, property or activities of any member of the Cuno Group. (b) To the extent that the Indemnifying Party is required to indemnify another party pursuant to this Article V, the Indemnifying Party shall pay to the Indemnifying Party, no later than 10 days prior to the due date of the relevant Tax Return or estimated Tax Return or 10 days after the Indemnifying Party received the Indemnified Party's calculations, whichever occurs later, the amount that the Indemnifying Party is required to pay the Indemnified Party. The Indemnified Party shall submit its calculations of the amount required to be paid pursuant to this Article V, showing such calculations in sufficient detail so as to permit the Indemnifying Party to understand the calculations. If the Indemnifying Party disagrees with such calculations, it must notify the Indemnified Party of its disagreement in writing within 15 days of receiving such calculations. Any dispute regarding such calculations shall be resolved in accordance with this Agreement. ARTICLE VI GENERAL PROVISIONS 6.1 Computations. Other than determinations of whether there are any indemnity obligations under this Agreement, all computations or recomputations of Income Tax Liability and all determinations, computations or recomputations of any amount or any payment (including, but not limited to, computations of the amount of the Income Tax Liability, the amount or effect of any loss, credit or deduction, the effect of a Federal statutory Tax rate change for a taxable year, and the amount of any interest, penalties or additions imposed with respect to any Income Tax) with respect to any Consolidated Return shall be prepared by the CIC and submitted to Cuno for its written approval. Any disagreement as to such computations after submission to Cuno by CIC shall be resolved by an Independent Accounting Firm. 6.2 Offsets. No payment shall be required to be made by either party to the other pursuant to this Agreement to the extent that there is an amount then due and payable under this Agreement to the party that is to make such payment. 6.3 Assignment. Neither this Agreement nor any of the rights, interest or obligations under this Agreement shall be assigned, in whole or in part, by operation of law or otherwise by any of the parties without the prior written consent of the other parties. Subject to the preceding sentence, this Agreement shall be binding upon, inure to the benefit of, and be enforceable to, the parties hereto and their respective successors and assigns. 6.4 Survival. The provisions of this Agreement shall remain in full force until all periods of limitations, including any extensions or waiver periods, for all Tax Periods of CIC and Cuno prior to or including the date of the distribution have expired. 6.5 Notices. Any notices, payments or other communications required by this Agreement shall be made to the Chief Executive Officer of the Cuno Group and the CIC Group. Copies of such notices, payments or other communications shall also be sent to the attention of the director of taxes of the Cuno Group and the CIC Group. 6.6 Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the State of Ohio. 6.7 Entire Agreement. This Agreement (a) constitutes the entire agreement and supersedes all prior agreement and understandings, both written and oral, among the parties with respect to the subject matter of this Agreement and (b) is not intended to confer upon any person other than the parties hereto any rights or remedies. The parties agree that to the extent the provision of any other agreements executed in connection with the Spin-Off are inconsistent with the provisions hereof, the provisions of the Agreement shall prevail. 6.8 Severability. If any provision of this Agreement or the application of any such provision to any person circumstances shall be held invalid, illegal or unenforceable in any respect by a court of competent jurisdiction, such invalidity, illegality or unenforceability shall not affect any other provision hereof. 6.9 Headings. The headings of the sections of this Agreement are inserted for convenience only and shall not constitute a part thereof or affect in any way the meaning or interpretation of this Agreement. 6.10 Counterparts. This Agreement may be executed simultaneously in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.