EXHIBIT 4.6

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                    CAPITAL SECURITIES GUARANTEE AGREEMENT

                             WESTBANK CORPORATION

                          Dated as of [_______], 1999

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                               TABLE OF CONTENTS
                               -----------------



                                                                                                               Page

                                                    ARTICLE I
                                           IDEFINITIONS AND INTERPRETATION
                                                                                                            
     SECTION 1.1 Definitions and Interpretation...............................................................  2

                                                  ARTICLE II
                                             TRUST INDENTURE ACT

     SECTION 2.1 Trust Indenture Act; Application.............................................................  5
     SECTION 2.2 Lists of Holders of Securities...............................................................  5
     SECTION 2.3 Reports by the Capital Securities Guarantee Trustee..........................................  5
     SECTION 2.4 Periodic Reports to the Capital Securities Guarantee Trustee.................................  6
     SECTION 2.5 Evidence of Compliance with Conditions Precedent.............................................  6
     SECTION 2.6 Waiver of Events of Default..................................................................  6
     SECTION 2.7 Notice of Events of Default..................................................................  6
     SECTION 2.8 Conflicting Interests........................................................................  7

                                                     ARTICLE III
                                              POWERS, DUTIES AND RIGHTS OF
                                           CAPITAL SECURITIES GUARANTEE TRUSTEE

     SECTION 3.1 Powers and Duties of the Capital Securities Guarantee Trustee................................  7
     SECTION 3.2 Certain Rights of the Capital Securities Guarantee Trustee...................................  8
     SECTION 3.3 Not Responsible for Recitals or Issuance of the Capital Securities Guarantee................. 10

                                                   ARTICLE IV
                                        CAPITAL SECURITIES GUARANTEE TRUSTEE

     SECTION 4.1 Capital Securities Guarantee Trustee; Eligibility............................................ 11
     SECTION 4.2 Appointment, Removal and Resignation of the Capital Securities Guarantee Trustee............. 11

                                                   ARTICLE V
                                                   GUARANTEE

     SECTION 5.1 Guarantee.................................................................................... 12
     SECTION 5.2 Waiver of Notice and Demand.................................................................. 12
     SECTION 5.3 Obligations Not Affected..................................................................... 12
     SECTION 5.4 Rights of Holders............................................................................ 13
     SECTION 5.5 Guarantee of Payment......................................................................... 14


                                      (i)



                                                                          Page
                                                                          ----
                                                                       
     SECTION 5.6 Subrogation............................................  14
     SECTION 5.7 Independent Obligations................................  14

                                  ARTICLE VI
                   LIMITATION OF TRANSACTIONS; SUBORDINATION

     SECTION 6.1 Limitation of Transactions.............................  14
     SECTION 6.2 Ranking................................................  15

                                  ARTICLE VII
                                  TERMINATION

     SECTION 7.1 Termination............................................  15

                                 ARTICLE VIII
                                INDEMNIFICATION

     SECTION 8.1 Exculpation............................................  15
     SECTION 8.2 Compensation and Indemnification.......................  16

                                  ARTICLE IX
                                 MISCELLANEOUS

     SECTION 9.1 Successors and Assigns.................................  16
     SECTION 9.2 Amendments.............................................  16
     SECTION 9.3 Notices................................................  17
     SECTION 9.4 Benefit................................................  18
     SECTION 9.5 Governing Law..........................................  18


                                     (ii)


                             CROSS REFERENCE TABLE



Section of Trust
Indenture Act of                                           Section of Guarantee
1939, as amended                                               Agreement
- ----------------                                               ---------
                                                        
     310(a)                                                      4.1(a)
     310(b)                                                    4.1(c), 2.8
     310(c)                                                   Inapplicable
     311(a)                                                      2.2(b)
     311(b)                                                      2.2(b)
     311(c)                                                   Inapplicable
     312(a)                                                      2.2(a)
     312(b)                                                      2.2(b)
     313                                                         2.3
     314(a)                                                      2.4
     314(b)                                                   Inapplicable
     314(c)                                                      2.5
     314(d)                                                   Inapplicable
     314(e)                                                    1.1, 2.5, 3.2
     314(f)                                                     2.1, 3.2
     315(a)                                                      3.1(d)
     315(b)                                                      2.7
     315(c)                                                      3.1(c)
     315(d)                                                      3.1(d)
     316(a)                                                    1.1, 2.6, 5.4
     316(b)                                                      5.3
     316(c)                                                      9.2
     317(a)                                                   Inapplicable
     317(b)                                                   Inapplicable
     318(a)                                                      2.1(a)
     318(c)                                                      2.1(b)


_______________

* This Cross-Reference Table does not constitute part of this Guarantee
  Agreement and shall not affect the interpretation of any of its terms or
  provisions.

                                     (iii)


                    CAPITAL SECURITIES GUARANTEE AGREEMENT

     This CAPITAL SECURITIES GUARANTEE AGREEMENT (the "Capital Securities
Guarantee"), dated as of [________], 1999, is executed and delivered by WESTBANK
CORPORATION, a Delaware corporation (the "Guarantor"), and WILMINGTON TRUST
COMPANY, a Delaware corporation, as trustee (the "Capital Securities Guarantee
Trustee" or "Trustee"), for the benefit of the Holders (as defined herein), from
time to time, of the Capital Securities (as defined herein) of WESTBANK CAPITAL
TRUST I, a Delaware statutory business trust (the "Issuer").

     WHEREAS, pursuant to an Amended and Restated Declaration of Trust (the
"Declaration"), dated as of [_________], 1999, by and among the trustees of the
Issuer named therein, the Guarantor, as sponsor, and the Holders, from time to
time, of undivided beneficial interests in the assets of the Issuer, the Issuer
is issuing capital securities, having a liquidation amount of $10 per capital
security, such capital securities being designated the [_______]% Capital
Securities (the "Capital Securities").

     WHEREAS, as incentive for the Holders to purchase the Capital Securities,
the Guarantor desires irrevocably and unconditionally to agree, to the extent
set forth in this Capital Securities Guarantee, to pay the Guarantee Payments
(as defined herein) to the Holders of the Capital Securities, and the Guarantor
agrees to make certain other payments on the terms and conditions set forth
herein.

     WHEREAS, the Guarantor is also executing and delivering the Common
Securities Guarantee Agreement, dated as of [__________], 1999 (the "Common
Securities Guarantee"), for the benefit of the holders of the Common Securities
(as defined herein), the terms of which provide that if an Event of Default (as
defined in the Declaration) has occurred and is continuing, the rights of
holders of the Common Securities to receive Guarantee Payments under the Common
Securities Guarantee are subordinated, to the extent and in the manner set forth
in the Common Securities Guarantee, to the rights of Holders of the Capital
Securities to receive Guarantee Payments under this Capital Securities
Guarantee.

     NOW, THEREFORE, in consideration of the purchase by each Holder of the
Capital Securities, which purchase the Guarantor hereby acknowledges shall
benefit the Guarantor, the Guarantor executes and delivers this Capital
Securities Guarantee for the benefit of such Holders.


                                   ARTICLE I

                        DEFINITIONS AND INTERPRETATION

     SECTION 1.1    Definitions and Interpretation
                    ------------------------------

     In this Capital Securities Guarantee, unless the context otherwise
requires:

     (a) capitalized terms used in this Capital Securities Guarantee but not
defined in the preamble above have the respective meanings assigned to them in
this Section 1.1;

     (b) terms defined in the Declaration as at the date of execution of this
Capital Securities Guarantee have the same meaning when used in this Capital
Securities Guarantee unless otherwise defined in this Capital Securities
Guarantee,

     (c) a term defined anywhere in this Capital Securities Guarantee has the
same meaning throughout;

     (d) all references to "the Capital Securities Guarantee" or "this Capital
Securities Guarantee" are references to this Capital Securities Guarantee as
modified, supplemented or amended from time to time;

     (e) all references in this Capital Securities Guarantee to Articles and
Sections references are to Articles and Sections of this Capital Securities
Guarantee, unless otherwise specified;

     (f) a term defined in the Trust Indenture Act has the same meaning when
used in this Capital Securities Guarantee, unless otherwise defined in this
Capital Securities Guarantee or unless the context otherwise requires; and

     (g) a reference to the singular includes the plural and vice versa.

     "Affiliate" has the same meaning as given to that term in Rule 405 under
      ---------
the Securities Act of 1933, as amended, or any successor rule thereunder.

     "Business Day" shall mean any day other than a Saturday or a Sunday, or a
      ------------
day on which banking institutions in Wilmington, Delaware, New York, New York or
Newport, New Hampshire are authorized or required by law or executive order to
remain closed.

     "Capital Securities Guarantee Trustee" shall mean Wilmington Trust Company
      ------------------------------------
as Trustee under the Capital Securities Guarantee, until a Successor Capital
Securities Guarantee Trustee has been appointed and has accepted such
appointment pursuant to the terms of this Capital Securities Guarantee, and
thereafter means each such Successor Capital Securities Guarantee Trustee.

     "Common Securities" shall mean the securities representing common undivided
      -----------------
beneficial interests in the assets of the Issuer.

     "Corporate Trust Office" shall mean the office of the Capital Securities
      ----------------------
Guarantee Trustee at which the corporate trust business of the Capital
Securities Guarantee Trustee shall, at any particular time, be principally
administered, which office at the date of execution of this Agreement

                                      -2-


is located at Rodney Square North, 1100 Market Street, Wilmington, Delaware
19890-0001, Attention: Corporate Trust Administration, or at any other time at
such other address as the Capital Securities Guarantee Trustee may designate
from time to time by notice to the Issuer.

     "Covered Person" shall mean any Holder or beneficial owner of the Capital
      --------------
Securities.

     "Debentures" shall mean the series of subordinated debt securities of the
      ----------
Guarantor designated the [_____]% Junior Subordinated Deferrable Interest
Debentures due [________], 2029, held by the Property Trustee (as defined in the
Declaration) of the Issuer.

     "Event of Default" shall mean a default by the Guarantor on any of its
      ----------------
payment or other obligations under this Capital Securities Guarantee; provided,
                                                                      --------
however, that, except with respect to default in respect of any Guarantee
- -------
Payment, no default by the Guarantor hereunder shall constitute an Event of
Default unless the Guarantor shall have received written notice of the default
and shall not have cured such default within 60 days after receipt thereof.

     "Guarantee Payments" shall mean the following payments or distributions,
      ------------------
without duplication, with respect to the Capital Securities, to the extent not
paid or made by or on behalf of the Issuer: (i) any accumulated and unpaid
Distributions (as defined in the Declaration) that are required to be paid on
such Capital Securities, to the extent the Issuer has funds legally available
therefor at such time, (ii) the redemption price, including all accumulated and
unpaid Distributions to the date of redemption (the "Redemption Price"), to the
extent the Issuer has funds legally available therefor at such time, with
respect to any Capital Securities called for redemption, and (iii) upon a
voluntary or involuntary dissolution, winding up or liquidation of the Issuer
(other than in connection with the distribution of Debentures to the Holders in
exchange for Capital Securities or in connection with the redemption of the
Capital Securities, in each case as provided in the Declaration), the lesser of
(a) the aggregate of the liquidation amount and all accumulated and unpaid
Distributions on the Capital Securities to the date of payment, to the extent
the Issuer has funds legally available therefor at such time, and (b) the amount
of assets of the Issuer remaining available for distribution to Holders after
satisfaction of liabilities to creditors of the Issuer as required by applicable
law (in either case, the "Liquidation Distribution"). If an Event of Default has
occurred and is continuing, no Guarantee Payments under the Common Securities
Guarantee with respect to the Common Securities or any guarantee payment under
any Other Common Securities Guarantee shall be made until the Holders of the
Capital Securities shall be paid in full the Guarantee Payments to which they
are entitled under this Capital Securities Guarantee.

     "Holder" shall mean any holder, as registered on the books and records of
      ------
the Issuer, of any Capital Securities; provided, however, that, in determining
                                       --------  -------
whether the holders of the requisite percentage of Capital Securities have given
any request, notice, consent or waiver hereunder, "Holder" shall not include the
Guarantor or any Person actually known to a Responsible Officer of the Capital
Securities Guarantee Trustee to be an Affiliate of the Guarantor.

     "Indemnified Person" shall mean the Capital Securities Guarantee Trustee
      ------------------
(including in its individual capacity), any Affiliate of the Capital Securities
Guarantee Trustee, or any officers, directors, shareholders, members, partners,
employees, representatives, nominees, custodians or agents of the Capital
Securities Guarantee Trustee.

     "Indenture" shall mean the Indenture, dated as of [________], 1999, between
      ---------
Westbank Corporation, as issuer of Debentures (the "Debenture Issuer"), and

                                      -3-


Wilmington Trust Company, as trustee, pursuant to which the Debentures are to be
issued to the Property Trustee of the Issuer.

     "Majority in Liquidation Amount of the Capital Securities" shall mean,
      --------------------------------------------------------
except as provided by the Trust Indenture Act, a vote by Holder(s) of the
Capital Securities, voting separately as a class, of more than   % of the
aggregate liquidation amount (including the amount that would be paid on
redemption, liquidation or otherwise, plus accumulated and unpaid Distributions
to the date upon which the voting percentages are determined) of all outstanding
Capital Securities.

     "Officers' Certificate" shall mean, with respect to any Person, a
      ---------------------
certificate signed by the Chairman of the Board, the Chief Executive Officer,
the President, an Executive or Senior Vice President, a Vice President or the
Chief Financial Officer and the Secretary or an Assistant Secretary. Any
Officers' Certificate delivered with respect to compliance with a condition or
covenant provided for in this Capital Securities Guarantee shall include:

     (a) a statement that each officer signing the Officers' Certificate has
read the covenants or conditions and the definitions relating thereto;

     (b)  a statement that each such officer has made such examination or
investigation as, in such officer's opinion, is necessary to enable such officer
to express an informed opinion as to whether or not such covenant or condition
has been complied with; and

     (c)  a statement as to whether or not, in the opinion of each such officer,
such condition or covenant has been complied with.

     "Other Common Securities Guarantees" shall have the same meaning as "Other
      ----------------------------------
Guarantees" in the Common Securities Guarantee.

     "Other Debentures" shall mean all junior subordinated debentures, other
      ----------------
than the Debentures, issued by the Guarantor, from time to time, and sold to
trusts other than the Issuer to be established by the Guarantor (if any), in
each case similar to the Issuer.

     "Other Guarantees" shall mean all guarantees, other than this Capital
      ----------------
Securities Guarantee, issued or to be issued by the Guarantor with respect to
capital securities (if any) similar to the Capital Securities, issued by trusts
other than the Issuer established or to be established by the Guarantor (if
any), in each case similar to the Issuer.

     "Person" shall mean a legal person, including any individual, corporation,
      ------
estate, partnership, joint venture, association, joint stock company, limited
liability company, trust, unincorporated association, or government or any
agency or political subdivision thereof, or any other entity of whatever nature.

     "Responsible Officer" shall mean, with respect to a Person, any officer
      -------------------
with direct responsibility for the administration of any matters relating to
this Capital Securities Guarantee.

     "Successor Capital Securities Guarantee Trustee" shall mean a successor
      ----------------------------------------------
Capital Securities Guarantee Trustee possessing the qualifications to act as
Capital Securities Guarantee Trustee under Section 4.1.

                                      -4-


     "Trust Indenture Act" shall mean the Trust Indenture Act of 1939, as
      -------------------
amended.

     "Trust Securities" shall mean the Common Securities and the Capital
      ----------------
Securities.


                                  ARTICLE II

                              TRUST INDENTURE ACT

     SECTION 2.1 Trust Indenture Act; Application
                 --------------------------------

     (a) This Capital Securities Guarantee is subject to the provisions of the
Trust Indenture Act that are required to be part of this Capital Securities
Guarantee and shall, to the extent applicable, be governed by such provisions.

     (b) If and to the extent that any provision of this Capital Securities
Guarantee limits, qualifies or conflicts with the duties imposed by Sections 310
to 317, inclusive, of the Trust Indenture Act, such imposed duties shall
control.  If any provision of this Capital Securities Guarantee modifies or
excludes any provision of the Trust Indenture Act that may be so modified or
excluded, the modified or excluded provision of the Trust Indenture Act shall be
deemed to apply to this Capital Securities Guarantee as so modified or excluded,
as the case may be.

     SECTION 2.2 Lists of Holders of Securities
                 ------------------------------

     (a) The Guarantor shall provide the Capital Securities Guarantee Trustee
(unless the Capital Securities Guarantee Trustee is otherwise the registrar of
the Capital Securities) with a list, in such form as the Capital Securities
Guarantee Trustee may reasonably require, of the names and addresses of the
Holders of the Capital Securities ("List of Holders") as of such date, (i)
within fourteen (14) days after each record date for payment of Distributions
(as defined in the Declaration), and (ii) at any other time within 30 days of
receipt by the Guarantor of a written request for a List of Holders as of a date
no more than 14 days before such List of Holders is given to the Capital
Securities Guarantee Trustee; provided, however, that the Guarantor shall not be
                              --------  -------
obligated to provide such List of Holders at any time the List of Holders does
not differ from the most recent List of Holders given to the Capital Securities
Guarantee Trustee by the Guarantor. The Capital Securities Guarantee Trustee may
destroy any List of Holders previously given to it upon receipt of a new List of
Holders.

     (b) The Capital Securities Guarantee Trustee shall comply with its
obligations under Sections 31l(a), 31l(b) and Section 312(b) of the Trust
Indenture Act.


     SECTION 2.3 Reports by the Capital Securities Guarantee Trustee
                 ---------------------------------------------------

     Within 60 days after        and             of each year, commencing
           , 1999, the Capital Securities Guarantee Trustee shall provide to the
Holders of the Capital Securities such reports as are required by Section 313 of
the Trust Indenture Act, if any, in the form and in the manner provided by
Section 313 of the Trust Indenture Act. The Capital Securities Guarantee Trustee
shall also comply with the requirements of Section 313(d) of the Trust Indenture
Act.

                                      -5-


     SECTION 2.4 Periodic Reports to the Capital Securities Guarantee Trustee
                 ------------------------------------------------------------

     The Guarantor shall provide to the Capital Securities Guarantee Trustee,
the Securities and Exchange Commission and the Holders such documents, reports
and information as are required by Section 314 of the Trust Indenture Act (if
any) and the compliance certificate required by Section 314 of the Trust
Indenture Act in the form, in the manner and at the times required by Section
314 of the Trust Indenture Act. Delivery of such reports, information and
documents to the Capital Securities Guarantee Trustee is for informational
purposes only, and the Capital Securities Guarantee Trustee's receipt of such
shall not constitute constructive notice of any information contained therein or
determinable from information contained therein, including the Guarantor's
compliance with any of its covenants hereunder (as to which the Capital
Securities Guarantee Trustee is entitled to rely exclusively on Officers'
Certificates).

     SECTION 2.5 Evidence of Compliance with Conditions Precedent
                 ------------------------------------------------

     The Guarantor shall provide to the Capital Securities Guarantee Trustee
such evidence of compliance with the conditions precedent, if any, provided for
in this Capital Securities Guarantee that relate to any of the matters set forth
in Section 314(c) of the Trust Indenture Act. Any certificate or opinion
required to be given by an officer pursuant to Section 314(c)(1) may be given in
the form of an Officers' Certificate.

     SECTION 2.6 Waiver of Events of Default
                 ---------------------------

     The Holders of a Majority in Liquidation Amount of the Capital Securities
may, by vote, on behalf of the Holders of all of the Capital Securities, waive
any past Event of Default and its consequences. Upon such waiver, any such Event
of Default shall cease to exist, and any Event of Default arising therefrom
shall be deemed to have been cured, for every purpose of this Capital Securities
Guarantee, but no such waiver shall extend to any subsequent or other default or
Event of Default or impair any right consequent thereon.

     SECTION 2.7 Notice of Events of Default
                 ---------------------------

     (a) The Capital Securities Guarantee Trustee shall, within    Business Days
after the occurrence of an Event of Default with respect to this Capital
Securities Guarantee actually known to a Responsible Officer of the Capital
Securities Guarantee Trustee, transmit by mail, first class postage prepaid, to
all Holders of the Capital Securities, notices of all such Events of Default,
unless such Events of Default have been cured before the giving of such notice;
provided, however, that, except in the case of an Event of Default arising from
- --------  -------
the non-payment of any Guarantee Payment, the Capital Securities Guarantee
Trustee shall be protected in withholding such notice if and so long as a
Responsible Officer of the Capital Securities Guarantee Trustee in good faith
determines that the withholding of such notice is in the interests of the
Holders of the Capital Securities.

     (b) The Capital Securities Guarantee Trustee shall not be deemed to have
knowledge of any Event of Default unless the Capital Securities Guarantee
Trustee shall have received written notice, or a Responsible Officer of the
Capital Securities Guarantee Trustee charged with the administration of the
Declaration shall have obtained actual knowledge, of such Event of Default.

                                      -6-


     SECTION 2.8 Conflicting Interests
                 ---------------------

     The Declaration shall be deemed to be specifically described in this
Capital Securities Guarantee for the purposes of clause (i) of the first proviso
contained in Section 310(b) of the Trust Indenture Act.

                                  ARTICLE III

                         POWERS, DUTIES AND RIGHTS OF
                     CAPITAL SECURITIES GUARANTEE TRUSTEE

     SECTION 3.1 Powers and Duties of the Capital Securities Guarantee Trustee
                 -------------------------------------------------------------

     (a) This Capital Securities Guarantee shall be held by the Capital
Securities Guarantee Trustee for the benefit of the Holders of the Capital
Securities, and the Capital Securities Guarantee Trustee shall not transfer this
Capital Securities Guarantee to any Person except a Holder of the Capital
Securities exercising his or her rights pursuant to Section 5.4(b) or to a
Successor Capital Securities Guarantee Trustee on acceptance by such Successor
Capital Securities Guarantee Trustee of its appointment to act as Successor
Capital Securities Guarantee Trustee. The right, title and interest of the
Capital Securities Guarantee Trustee shall automatically vest in any Successor
Capital Securities Guarantee Trustee, and such vesting and succession of title
shall be effective whether or not conveyancing documents have been executed and
delivered pursuant to the appointment of such Successor Capital Securities
Guarantee Trustee.

     (b) If an Event of Default actually known to a Responsible Officer of the
Capital Securities Guarantee Trustee has occurred and is continuing, the Capital
Securities Guarantee Trustee shall enforce this Capital Securities Guarantee for
the benefit of the Holders of the Capital Securities.

     (c) The Capital Securities Guarantee Trustee, before the occurrence of any
Event of Default (of which, other than a default in respect of any Guarantee
Payment, a Responsible Officer of the Property Trustee has actual knowledge) and
after the curing of all such Events of Default that may have occurred, shall
undertake to perform only such duties as are specifically set forth in this
Capital Securities Guarantee, and no implied covenants or obligations shall be
read into this  Capital Securities Guarantee against the Capital Securities
Guarantee Trustee. In case an Event of Default has occurred (that has not been
cured or waived pursuant to Section 2.6) and is actually known to a Responsible
Officer of the Capital Securities Guarantee Trustee, the Capital Securities
Guarantee Trustee shall exercise such of the rights and powers vested in it by
this Capital Securities Guarantee, and use the same degree of care and skill in
its exercise thereof, as a prudent person would exercise or use under the
circumstances in the conduct of his or her own affairs.

     (d) No provision of this Capital Securities Guarantee shall be construed to
relieve the Capital Securities Guarantee Trustee from liability for its own
negligent action, its own negligent failure to act, or its own willful
misconduct, except that:

         (i) prior to the occurrence of any Event of Default (of which, other
     than a default in respect of any Guarantee Payment, a Responsible Officer
     of the Property Trustee

                                      -7-


     actual knowledge) and after the curing or waiving of all such Events of
     Default that may have occurred:

          (A)   the duties and obligations of the Capital Securities Guarantee
     Trustee shall be determined solely by the express provisions of this
     Capital Securities Guarantee, and the Capital Securities Guarantee Trustee
     shall not be liable except for the performance of such duties and
     obligations as are specifically set forth in this Capital Securities
     Guarantee, and no implied covenants or obligations shall be read into this
     Capital Securities Guarantee against the Capital Securities Guarantee
     Trustee; and

          (B)   in the absence of bad faith on the part of the Capital
     Securities Guarantee Trustee, the Capital Securities Guarantee Trustee may
     conclusively rely, as to the truth of the statements and the correctness of
     the opinions expressed therein, upon any certificates or opinions furnished
     to the Capital Securities Guarantee Trustee and conforming to the
     requirements of this Capital Securities Guarantee; provided, however, that
                                                        --------  -------
     in the case of any such certificates or opinions that by any provision
     hereof are specifically required to be furnished to the Capital Securities
     Guarantee Trustee, the Capital Securities Guarantee Trustee shall be under
     a duty to examine the same to determine whether or not on their face they
     conform to the requirements of this Capital Securities Guarantee;

          (ii)  the Capital Securities Guarantee Trustee shall not be liable for
     any errors of judgment made in good faith by a Responsible Officer of the
     Capital Securities Guarantee Trustee, unless it shall be proved that the
     Capital Securities Guarantee Trustee or such Responsible Officer was
     negligent in ascertaining the pertinent facts upon which such judgment was
     made;

          (iii) the Capital Securities Guarantee Trustee shall not be liable
     with respect to any actions taken or omitted to be taken by it in good
     faith in accordance with the direction of the Holders of a Majority in
     Liquidation Amount of the Capital Securities relating to the time, method
     and place of conducting any proceeding for any remedy available to the
     Capital Securities Guarantee Trustee, or exercising any trust or power
     conferred upon the Capital Securities Guarantee Trustee under this Capital
     Securities Guarantee; and

          (iv)  no provision of this Capital Securities Guarantee shall require
     the Capital Securities Guarantee Trustee to expend or risk its own funds or
     otherwise incur personal financial liability in the performance of any of
     its duties or in the exercise of any of its rights or powers, if the
     Capital Securities Guarantee Trustee shall have reasonable grounds for
     believing that the repayment of such funds or liability is not reasonably
     assured to it under the terms of this Capital Securities Guarantee or
     indemnity, reasonably satisfactory to the Capital Securities Guarantee
     Trustee, against such risk or liability is not reasonably assured to it.

     SECTION 3.2  Certain Rights of the Capital Securities Guarantee Trustee
                  ----------------------------------------------------------

     (a) Subject to the provisions of Section 3.1:

          (i)   the Capital Securities Guarantee Trustee may conclusively rely,
     and shall be fully protected in acting or refraining from acting, upon any
     resolution, certificate, statement, instrument, opinion, report, notice,
     request, direction, consent, order, bond, debenture, note,

                                      -8-


     other evidence of indebtedness or other paper or document believed by it to
     be genuine and to have been signed, sent or presented by the proper party
     or parties;

          (ii)   any direction or act of the Guarantor contemplated by this
     Capital Securities Guarantee may be sufficiently evidenced by an Officers'
     Certificate;

          (iii)  whenever, in the administration of this Capital Securities
     Guarantee, the Capital Securities Guarantee Trustee shall deem it desirable
     that a matter be proved or established before taking, suffering or omitting
     any action hereunder, the Capital Securities Guarantee Trustee (unless
     other evidence is herein specifically prescribed) may, in the absence of
     bad faith on its part, request and conclusively rely upon an Officers'
     Certificate, which, upon receipt of such request, shall be promptly
     delivered by the Guarantor;

          (iv)   the Capital Securities Guarantee Trustee shall have no duty to
     see to any recording, filing or registration of any instrument or other
     document (or any rerecording, refiling or registration thereof);

          (v)    the Capital Securities Guarantee Trustee may consult with
     counsel of its selection, and the advice or opinion of such counsel with
     respect to legal matters shall be full and complete authorization and
     protection in respect of any action taken, suffered or omitted by it
     hereunder in good faith and in accordance with such advice or opinion; and
     such counsel may be counsel to the Guarantor or any of its Affiliates and
     may include any of its employees; the Capital Securities Guarantee Trustee
     shall have the right at any time to seek instructions concerning the
     administration of this Capital Securities Guarantee from any court of
     competent jurisdiction;

          (vi)   the Capital Securities Guarantee Trustee shall be under no
     obligation to exercise any of the rights or powers vested in it by this
     Capital Securities Guarantee at the request or direction of any Holder,
     unless such Holder shall have provided to the Capital Securities Guarantee
     Trustee such security and indemnity, reasonably satisfactory to the Capital
     Securities Guarantee Trustee, against the costs, expenses (including
     attorneys' fees and expenses and the expenses of the Capital Securities
     Guarantee Trustee's agents, nominees or custodians) and liabilities that
     might be incurred by it in complying with such request or direction,
     including such reasonable advances as may be requested by the Capital
     Securities Guarantee Trustee, provided, however, that nothing contained in
                                   --------  -------
     this Section 3.2(a)(vi) shall be taken to relieve the Capital Securities
     Guarantee Trustee, upon the occurrence of an Event of Default, of its
     obligation to exercise the rights and powers vested in it by this Capital
     Securities Guarantee;

          (vii)  the Capital Securities Guarantee Trustee shall have no
     obligation to make any investigation into the facts or matters stated in
     any resolution, certificate, statement, instrument, opinion, report,
     notice, request, direction, consent, order, bond, debenture, note, other
     evidence of indebtedness or other paper or document, but the Capital
     Securities Guarantee Trustee, in its discretion, may make such further
     inquiry or investigation into such facts or matters as it may see fit;

          (viii) the Capital Securities Guarantee Trustee may execute any of
     the trusts or powers hereunder or perform any duties hereunder either
     directly or by or through agents, nominees, custodians or attorneys, and
     the Capital Securities Guarantee Trustee shall not

                                      -9-


     be responsible for any misconduct or negligence on the part of any such
     person appointed with due care by it hereunder;

          (ix)  any action taken by the Capital Securities Guarantee Trustee or
     its agents hereunder shall bind the Holders of the Capital Securities, and
     the signature of the Capital Securities Guarantee Trustee or its agents
     alone shall be sufficient and effective to perform any such action; and no
     third party shall be required to inquire as to the authority of the Capital
     Securities Guarantee Trustee to so act or as to its compliance with any of
     the terms and provisions of this Capital Securities Guarantee, both of
     which shall be conclusively evidenced by the Capital Securities Guarantee
     Trustee's or its agent's taking such action;

          (x)   whenever in the administration of this Capital Securities
     Guarantee the Capital Securities Guarantee Trustee shall deem it desirable
     to receive instructions with respect to enforcing any remedy or right or
     taking any other action hereunder, the Capital Securities Guarantee Trustee
     (i) may request instructions from the Holders of a Majority in Liquidation
     Amount of the Capital Securities, (ii) may refrain from enforcing such
     remedy or right or taking such other action until such instructions are
     received, and (iii) shall be protected in conclusively relying on or acting
     in accordance with such instructions; and

          (xi)  the Capital Securities Guarantee Trustee shall not be liable for
     any action taken, suffered, or omitted to be taken by it in good faith,
     without negligence, and reasonably believed by it to be authorized or
     within the discretion or rights or powers conferred upon it by this Capital
     Securities Guarantee.

     (b)  No provision of this Capital Securities Guarantee shall be deemed to
impose any duty or obligation on the Capital Securities Guarantee Trustee to
perform any act or acts or exercise any right, power, duty or obligation
conferred or imposed on it in any jurisdiction in which it shall be illegal, or
in which the Capital Securities Guarantee Trustee shall be unqualified or
incompetent in accordance with applicable law, to perform any such act or acts
or to exercise any such right, power, duty or obligation. No permissive power or
authority available to the Capital Securities Guarantee Trustee shall be
construed to be a duty.

     SECTION 3.3    Not Responsible for Recitals or Issuance of the
                    -----------------------------------------------
                    Capital Securities Guarantee
                    ----------------------------

     The recitals contained in this Capital Securities Guarantee shall be taken
as the statements of the Guarantor, and the Capital Securities Guarantee Trustee
does not assume any responsibility for their correctness. The Capital Securities
Guarantee Trustee makes no representation as to the validity or sufficiency of
this Capital Securities Guarantee.


                                     -10-


                                  ARTICLE IV

                     CAPITAL SECURITIES GUARANTEE TRUSTEE

     SECTION 4.1    Capital Securities Guarantee Trustee; Eligibility
                    -------------------------------------------------

     (a) There shall at all times be a Capital Securities Guarantee Trustee that
shall

         (i)   not be an Affiliate of the Guarantor; and

         (ii)  be a corporation or other Person organized and doing business
     under the laws of the United States of America or any state or territory
     thereof or of the District of Columbia, or a corporation or other Person
     permitted by the Securities and Exchange Commission to act as an indenture
     trustee under the Trust Indenture Act, authorized under such laws to
     exercise corporate trust powers, having a combined capital and surplus of
     at least fifty million U.S. dollars ($50,000,000), and subject to
     supervision or examination by federal, state, territorial or District of
     Columbia authority; it being understood that if such corporation or other
     Person publishes reports of condition at least annually, pursuant to law or
     to the requirements of the supervising or examining authority referred to
     above, then, for the purposes of this Section 4.1(a)(ii) and to the extent
     permitted by the Trust Indenture Act, the combined capital and surplus of
     such corporation shall be deemed to be its combined capital and surplus as
     set forth in its most recent report of condition so published.

     (b) If at any time the Capital Securities Guarantee Trustee shall cease to
be eligible to so act under Section 4.1(a), the Capital Securities Guarantee
Trustee shall immediately resign in the manner and with the effect set out in
Section 4.2(c).

     (c) If the Capital Securities Guarantee Trustee has or shall acquire any
"conflicting interest" within the meaning of Section 310(b) of the Trust
Indenture Act, the Capital Securities Guarantee Trustee and Guarantor shall in
all respects comply with the provisions of Section 310(b) of the Trust Indenture
Act.

     SECTION 4.2    Appointment, Removal and Resignation of the Capital
                    ---------------------------------------------------
                    Securities Guarantee Trustee
                    ----------------------------

     (a) Subject to Section 4.2(b), the Capital Securities Guarantee Trustee may
be appointed or removed without cause at any time by the Guarantor except during
an Event of Default.

     (b) The Capital Securities Guarantee Trustee shall not be removed in
accordance with Section 4.2(a) until a Successor Capital Securities Guarantee
Trustee has been appointed and has accepted such appointment by written
instrument executed by such Successor Capital Securities Guarantee Trustee and
delivered to the Guarantor.

     (c) The Capital Securities Guarantee Trustee shall hold office until a
Successor Capital Securities Guarantee Trustee shall have been appointed or
until its removal or resignation. The Capital Securities Guarantee Trustee may
resign from office (without need for prior or subsequent accounting) by an
instrument in writing executed by the Capital Securities Guarantee Trustee and
delivered to the Guarantor, which resignation shall not take effect until a
Successor Capital

                                     -11-


Securities Guarantee Trustee has been appointed and has accepted such
appointment by instrument in writing executed by such Successor Capital
Securities Guarantee Trustee and delivered to the Guarantor and the resigning
Capital Securities Guarantee Trustee.

     (d) If no Successor Capital Securities Guarantee Trustee shall have been
appointed and accepted appointment as provided in this Section 4.2 within 60
days after delivery of an instrument of removal or resignation, the Capital
Securities Guarantee Trustee resigning or being removed may petition any court
of competent jurisdiction for appointment of a Successor Capital Securities
Guarantee Trustee. Such court may thereupon, after prescribing such notice, if
any, as it may deem proper, appoint a Successor Capital Securities Guarantee
Trustee.

     (e) No Capital Securities Guarantee Trustee shall be liable for the acts or
omissions to act of any Successor Capital Securities Guarantee Trustee.

     (f) Upon termination of this Capital Securities Guarantee or removal or
resignation of the Capital Securities Guarantee Trustee pursuant to this Section
4.2, the Guarantor shall pay to the Capital Securities Guarantee Trustee all
amounts due to the Capital Securities Guarantee Trustee accrued to the date of
such termination, removal or resignation.


                                   ARTICLE V

                                   GUARANTEE

     SECTION 5.1    Guarantee
                    ---------

     The Guarantor irrevocably and unconditionally agrees to pay in full to the
Holders the Guarantee Payments (without duplication of amounts theretofore paid
by the Issuer), as and when due, regardless of any defense, right of set-off or
counterclaim that the Issuer may have or assert. The Guarantor's obligation to
make a Guarantee Payment may be satisfied by direct payment of the required
amounts by the Guarantor to the Holders or by causing the Issuer to pay such
amounts to the Holders.

     SECTION 5.2    Waiver of Notice and Demand
                    ---------------------------

     The Guarantor hereby waives notice of acceptance of this Capital Securities
Guarantee and of any liability to which it applies or may apply, presentment,
demand for payment, any right to require a proceeding first against the Issuer
or any other Person before proceeding against the Guarantor, protest, notice of
nonpayment, notice of dishonor, notice of redemption and all other notices and
demands.

     SECTION 5.3    Obligations Not Affected
                    ------------------------

     The obligations, covenants, agreements and duties of the Guarantor under
this Capital Securities Guarantee shall in no way be affected or impaired by
reason of the happening from time to time of any of the following:

                                     -12-


     (a) the release or waiver, by operation of law or otherwise, of the
performance or observance by the Issuer of any express or implied agreement,
covenant, term or condition relating to the Capital Securities to be performed
or observed by the Issuer;

     (b) the extension of time for the payment by the Issuer of all or any
portion of the Distributions, Redemption Price, Liquidation Distribution or any
other sums payable under the terms of the Capital Securities or the extension of
time for the performance of any other obligation under, arising out of, or in
connection with, the Capital Securities;

     (c) any failure, omission, delay or lack of diligence on the part of the
Holders to enforce, assert or exercise any right, privilege, power or remedy
conferred on the Holders pursuant to the terms of the Capital Securities, or any
action on the part of the Issuer granting indulgence or extension of any kind;

     (d) the voluntary or involuntary liquidation, dissolution, sale of any
collateral, receivership, insolvency, bankruptcy, assignment for the benefit of
creditors, reorganization, arrangement, composition or readjustment of debt of,
or other similar proceedings affecting, the Issuer or any of the assets of the
Issuer;

     (e) any invalidity of, or defect or deficiency in, the Capital Securities;

     (f) the settlement or compromise of any obligation guaranteed hereby or
hereby incurred;
     (g) any other circumstance whatsoever that might otherwise constitute a
legal or equitable discharge or defense of a guarantor;

it being the intent of this Section 5.3 that the obligations of the Guarantor
with respect to the Guarantee Payments shall be absolute and unconditional under
any and all circumstances.

     There shall be no obligation of the Holders to give notice to, or obtain
consent of, the Guarantor with respect to the happening of any of the foregoing.

     SECTION 5.4    Rights of Holders
                    -----------------

     (a) The Holders of a Majority in Liquidation Amount of the Capital
Securities have the right to direct the time, method and place of conducting any
proceeding for any remedy available to the Capital Securities Guarantee Trustee
in respect of this Capital Securities Guarantee or exercising any trust or power
conferred upon the Capital Securities Guarantee Trustee under this Capital
Securities Guarantee.

     (b) If the Capital Securities Guarantee Trustee fails to enforce this
Capital Securities Guarantee, any Holder of the Capital Securities may institute
a legal proceeding directly against the Guarantor to enforce the Capital
Securities Guarantee Trustee's rights under this Capital Securities Guarantee,
without first instituting a legal proceeding against the Issuer, the Capital
Securities Guarantee Trustee or any other person or entity. The Guarantor waives
any right or remedy to require that any action be brought first against the
Issuer or any other person or entity before proceeding directly against the
Guarantor.

                                     -13-


     SECTION 5.5    Guarantee of Payment
                    --------------------

     This Capital Securities Guarantee creates a guarantee of payment and not of
collection.

     SECTION 5.6    Subrogation
                    -----------

     The Guarantor shall be subrogated to all (if any) rights of the Holders of
Capital Securities against the Issuer in respect of any amounts paid to such
Holders by the Guarantor under this Capital Securities Guarantee; provided,
                                                                  --------
however, that the Guarantor shall not (except to the extent required by
- -------
mandatory provisions of law) be entitled to enforce or exercise any right that
it may acquire by way of subrogation or any indemnity, reimbursement or other
agreement, in all cases as a result of payment under this Capital Securities
Guarantee, if, at the time of any such payment, any amounts are due and unpaid
under this Capital Securities Guarantee. If any amount shall be paid to the
Guarantor in violation of the preceding sentence, the Guarantor agrees to hold
such amount in trust for the Holders and to pay over such amount to the Holders.

     SECTION 5.7    Independent Obligations
                    -----------------------

     The Guarantor acknowledges that its obligations hereunder are independent
of the obligations of the Issuer with respect to the Capital Securities, and
that the Guarantor shall be liable as principal and as debtor hereunder to make
Guarantee Payments pursuant to the terms of this Capital Securities Guarantee
notwithstanding the occurrence of any event referred to in subsections (a)
through (g), inclusive, of Section 5.3 hereof.


                                  ARTICLE VI

                   LIMITATION OF TRANSACTIONS; SUBORDINATION

     SECTION 6.1    Limitation of Transactions
                    --------------------------

     So long as any Capital Securities remain outstanding, if (l) there shall
have occurred any event of which the Guarantor has actual knowledge that (A) is
a Default or Event of Default (each as defined in the Indenture) and (B) in
respect of which the Guarantor shall not have taken reasonable steps to cure,
(2) if the Debentures are held by the Property Trustee, the Guarantor shall be
in default with respect to its payment of any obligations under this Capital
Securities Guarantee or (3) the Guarantor shall have given notice of its
election of the exercise of its right to commence an Extended Interest Payment
Period as provided in the Indenture and shall not have rescinded such notice,
and such Extended Interest Payment Period, or an extension thereof, shall have
commenced and be continuing, the Guarantor shall not (i) declare or pay any
dividends or distributions on, or redeem, purchase, acquire, or make a
liquidation payment with respect to, any of the Guarantor's capital stock, (ii)
make any payment of principal of, or interest or premium, if any, on or repay,
repurchase or redeem any debt securities of the Guarantor (including Other
Debentures) that rank pari passu with or junior in right of payment to the
Debentures or (iii) make any guarantee payments with respect to any guarantee by
the Guarantor of the debt securities of any subsidiary of the Guarantor
(including Other Guarantees) if such guarantee ranks pari passu with or junior
in right of payment to the Debentures (other than (a) dividends or distributions
in shares of, or options, warrants, rights to subscribe for or purchase shares
of, common stock of the Guarantor, (b) any declaration of a dividend in
connection with the implementation of a stockholders' rights plan, or the

                                     -14-


issuance of stock under any such plan in the future, or the redemption or
repurchase of any such rights pursuant thereto, (c) payments under this Capital
Securities Guarantee, (d) as a result of a reclassification of the Guarantor's
capital stock or the exchange or the conversion of one class or series of the
Guarantor's capital stock for another class or series of the Guarantor's capital
stock, (e) the purchase of fractional interests in shares of the Guarantor's
capital stock pursuant to the conversion or exchange provisions of such capital
stock or the security being converted or exchanged, and (f) purchases of common
stock related to the issuance of common stock or rights under any of the
Guarantor's benefit or compensation plans for its directors, officers or
employees or any of the Guarantor's dividend reinvestment plans).

     SECTION 6.2    Ranking
                    -------

     This Capital Securities Guarantee will constitute an unsecured obligation
of the Guarantor and will rank (i) subordinate and junior in right of payment to
Senior Indebtedness (as defined in the Indenture), to the same extent and in the
same manner that the Debentures are subordinated to Senior Indebtedness pursuant
to the Indenture, it being understood that the terms of Article XV of the
Indenture shall apply to the obligations of the Guarantor under this Capital
Securities Guarantee as if such Article XV were set forth herein in full, (ii)
pari passu with the most senior preferred or preference stock now or hereafter
issued by the Guarantor, any Other Guarantee and, except to the extent set forth
therein, the Common Securities Guarantee, any Other Common Securities Guarantee,
and any guarantee now or hereafter entered into by the Guarantor in respect of
any preferred or preference stock of any Affiliate of the Guarantor, and (iii)
senior to the Guarantor's common stock.


                                  ARTICLE VII

                                  TERMINATION

     SECTION 7.1    Termination
                    -----------

     This Capital Securities Guarantee shall terminate and be of no further
force or effect upon (i) full payment of the Redemption Price of all Capital
Securities or (ii) the dissolution, winding up or liquidation of the Issuer,
immediately following the full payment of the amounts payable in accordance with
the Declaration or the distribution of all of the Debentures to the holders of
the Trust Securities (as defined in the Declaration).  Notwithstanding the
foregoing, this Capital Securities Guarantee will continue to be effective or
will be reinstated, as the case may be, if at any time any Holder of the Capital
Securities must restore payment of any sums paid under the Capital Securities or
under this Capital Securities Guarantee.

                                  ARTICLE VII

                                INDEMNIFICATION

     SECTION 8.1    Exculpation
                    -----------

     (a) No Indemnified Person shall be liable, responsible or accountable in
damages or otherwise to the Guarantor or any Covered Person for any loss, damage
or claim incurred by reason of any act or omission performed or omitted by such
Indemnified Person in good faith in accordance with this Capital Securities
Guarantee and in a manner that such Indemnified Person reasonably

                                     -15-


believed to be within the scope of the authority conferred on such Indemnified
Person by this Capital Securities Guarantee or by law, except that an
Indemnified Person shall be liable for any such loss, damage or claim incurred
by reason of such Indemnified Person's negligence or willful misconduct with
respect to such acts or omissions.

     (b) An Indemnified Person shall be fully protected in relying in good faith
upon the records of the Guarantor and upon such information, opinions, reports
or statements presented to the Guarantor by any Person as to matters the
Indemnified Person reasonably believes are within such other Person's
professional or expert competence and who has been selected with reasonable care
by or on behalf of the Guarantor, including information, opinions, reports or
statements as to the value and amount of the assets, liabilities, profits,
losses, or any other facts pertinent to the existence and amount of assets from
which Distributions to Holders of the Capital Securities might properly be paid.

     SECTION 8.2    Compensation and Indemnification
                    --------------------------------

     The Guarantor agrees to pay to the Capital Securities Guarantee Trustee
such compensation for its services as shall be mutually agreed upon by the
Guarantor and the Capital Securities Guarantee Trustee. The Guarantor shall
reimburse the Capital Securities Guarantee Trustee upon request for all
reasonable out-of-pocket expenses incurred by it, including the reasonable
compensation and expenses of the Capital Securities Guarantee Trustee's agents
and counsel, except any expense as may be attributable to the negligence or bad
faith of the Capital Securities Guarantee Trustee.

     The Guarantor agrees to indemnify each Indemnified Person for, and to hold
each Indemnified Person harmless against, any and all loss, liability, damage,
action, suit, claim or expense incurred without negligence or bad faith on its
part, arising out of or in connection with the acceptance or administration of
the trust or trusts hereunder, including the costs and expenses (including
reasonable legal fees and expenses) of defending itself against, or
investigating, any claim or liability in connection with the exercise or
performance of any of its powers or duties hereunder. The provisions of this
Section 8.2 shall survive the termination of this Capital Securities Guarantee
and shall survive the resignation or removal of the Capital Securities Guarantee
Trustee.

                                  ARTICLE IX

                                 MISCELLANEOUS

     SECTION 9.1    Successors and Assigns
                    ----------------------

     All guarantees and agreements contained in this Capital Securities
Guarantee shall bind the successors, assigns, receivers, trustees and
representatives of the Guarantor and shall inure to the benefit of the Holders
of the Capital Securities then outstanding.

     SECTION 9.2    Amendments
                    ----------

     Except with respect to any changes that do not materially adversely affect
the rights of Holders of the Capital Securities (in which case no consent of
such Holders will be required), this Capital Securities Guarantee may only be
amended with the prior approval of the Holders of a Majority in Liquidation
Amount of the Capital Securities. The provisions of Section 12.2 of the

                                     -16-


Declaration with respect to meetings of Holders of the Trust Securities apply to
the giving of such approval. This Capital Securities Guarantee may not be
amended, and no amendment hereof that affects the Capital Securities Guarantee
Trustee's rights, duties or immunities hereunder or otherwise, shall be
effective, unless such amendment is executed by the Capital Securities Guarantee
Trustee (which shall have no obligation to execute any such amendment, but may
do so in its sole discretion).

     SECTION 9.3    Notices
                    -------

     All notices provided for in this Capital Securities Guarantee shall be in
writing, duly signed by the party giving such notice, and shall be delivered,
telecopied or mailed by first class mail, as follows:

     (a) If given to the Issuer, in care of the Administrative Trustees at the
Issuer's mailing address set forth below (or such other address as the Issuer
may give notice of to the Capital Securities Guarantee Trustee and the Holders
of the Capital Securities):

                    WESTBANK CAPITAL TRUST I
                    c/o WESTBANK CORPORATION
                    225 Park Avenue
                    West Springfield, Massachusetts 01089-3326
                    Attention:
                    Telephone:
                    Telecopier:

     (b) If given to the Capital Securities Guarantee Trustee, at the Capital
Securities Guarantee Trustee's mailing address set forth below (or such other
address as the Capital Securities Guarantee Trustee may give notice of to the
Holders of the Capital Securities):

                    Wilmington Trust Company
                    Rodney Square North
                    1100 Market Street
                    Wilmington, Delaware 19890-0001
                    Attention:  Corporate Trust Administration
                    Telephone:  (302) 651-1000
                    Telecopier: (302) 651-8882

     (c) If given to the Guarantor, at the Guarantor's mailing address set forth
below (or such other address as the Guarantor may give notice of to the Capital
Securities Guarantee Trustee and the Holders of the Capital Securities):

                    WESTBANK CORPORATION
                    225 Park Avenue
                    West Springfield, Massachusetts 01089-3326
                    Attention:
                    Telephone:
                    Telecopier:

                                     -17-


     (d) If given to any Holder of the Capital Securities, at the address set
forth on the books and records of the Issuer.

     All such notices shall be deemed to have been given when received in
person, telecopied with receipt confirmed, or mailed by first class mail,
postage prepaid except that if a notice or other document is refused delivery or
cannot be delivered because of a changed address of which no notice was given,
such notice or other document shall be deemed to have been delivered on the date
of such refusal or inability to deliver.

     SECTION 9.4    Benefit
                    -------

     This Capital Securities Guarantee is solely for the benefit of the Holders
of the Capital Securities and, subject to Section 3.1(a), is not separately
transferable from the Capital Securities.

     SECTION 9.5    Governing Law
                    -------------

     THIS CAPITAL SECURITIES GUARANTEE SHALL BE DEEMED TO BE A CONTRACT MADE
UNDER THE LAWS OF THE STATE OF NEW YORK, AND FOR ALL PURPOSES SHALL BE GOVERNED
BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF
NEW YORK WITHOUT REGARD TO CONFLICT OF LAW PRINCIPLES THEREOF.

     This Capital Securities Guarantee is executed as of the day and year first
above written.

                         WESTBANK CORPORATION
                         as Guarantor


                         By:__________________________________________

                            President and Chief Executive Officer


                         WILMINGTON TRUST COMPANY,
                         as Capital Securities Guarantee Trustee


                         By:__________________________________________
                            Name:
                            Title:

                                     -18-