Exhibit (10.x)


                                 AMENDMENT NO. 1
                                       TO
                   DIRECTOR'S RETIREMENT PLAN TRUST AGREEMENT
                                 by and between
                               MET-PRO CORPORATION
                                       and
                                MELLON BANK, N.A.

        THIS AMENDMENT TO THE DIRECTOR'S RETIREMENT PLAN TRUST AGREEMENT is made
and entered into this 24th day of February,  2003 ("Amendment"),  by and between
MET-PRO CORPORATION ("Company") and MELLON BANK, N.A. ("Trustee").

                                   WITNESSETH:

        WHEREAS, Company and Trustee entered into the Director's Retirement Plan
Trust Agreement ("Agreement") on February 11, 2000; and

        WHEREAS,  Company wishes to amend the Agreement to revise the provisions
of Section  1(b) of the  Agreement to  correspond  to Section (b) of the Met-Pro
Pension Restoration and Supplemental  Executive Retirement Plan Trust Agreement;
and

        WHEREAS, Company and Mellon now wish to amend the Agreement to make such
change;

        NOW,  THEREFORE,  the parties hereto,  intending to be legally bound, do
hereby amend the Agreement as follows:

        1.      The definitions set forth above are incorporated  herein by this
                reference thereto.

        2.      Section 1(b) is amended and restated to read as follows:

                "(b)    Upon a Change of Control  (as  defined in Section 14 of
                the Trust),  the  Trustee  shall,  immediately  upon the  Change
                of Control, pay  each Plans participant or beneficiaries thereof
                the benefits  to which Plan participants  or their beneficiaries
                would  be entitled pursuant  to the terms of the Plans as of the
                date on  which the  Change of  Control  occurred  to the  extent
                then funded under the Trust.

                        In the  event a Change of  Control  of the  Company  (as
                defined in  Section  14 of the  Trust)  shall be deemed to occur
                (whenever  such shall  occur,  and  whether or not the  Eligible
                Executive  is then  employed  by the Company or shall be alive),


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                all payments due to the Eligible Executive, his surviving spouse
                of other  beneficiary  under the Plans shall be accelerated  and
                immediately  paid in a lump sum payment in an amount  determined
                in accordance with the provisions of the Plans."

        3.      Except as set forth herein, the Agreement is hereby ratified and
                confirmed and remains in full force and effect.

        IN WITNESS  WHEREOF,  the parties  hereto,  each intending to be legally
bound hereby,  have  executed this  Amendment as of the day and year first above
written.  The parties hereby each represent and warrant to the other that is has
full  authority  to approve  and adopt this  Amendment  and that the  individual
executing  this  Amendment  on its behalf has the  requisite  authority  to bind
Company or Trustee to this Amendment.

MELLON BANK, N.A.                           MET-PRO CORPORATION

By:                                         By: /s/ Raymond J. De Hont
    ------------------------                    -----------------------
Name:                                       Name: Raymond J. De Hont
     -----------------------                     ----------------------
Title:                                      Title: President
       ---------------------                       --------------------