Exhibit 10(k)

                                 AMENDMENT NO. 1
                                     TO THE
                         MET-PRO CORPORATION DIRECTORS'
                                 RETIREMENT PLAN

     This Amendment to the Met-Pro Corporation  Directors'  Retirement Plan (the
"Plan") is made effective this 16th day of December, 1999.

     WHEREAS,  Met-Pro  Corporation (the "Company")  previously adopted the Plan
and now wishes to amend the Plan as herein stated.

     NOW, THEREFORE, the Plan is hereby amended in the following manner:

     1. A new Section 10 is added as follows:

          "10. Termination,  Suspension or Amendment.  The Board of Directors in
     its sole  discretion may terminate,  suspend or amend this Plan at any time
     or from time to time, in whole or in part, provided,  however, that no such
     termination,  suspension or amendment  shall  adversely  affect the accrued
     benefit of a Director,  their surviving spouse or other  beneficiary who is
     then entitled to or receiving a benefit."

     2.  Section 3 is hereby  amended by adding the  following at the end of the
existing Section 3:

          "Notwithstanding  anything in this Plan to the contrary,  effective as
     of  December  16,  1999,  the  following  persons  shall not be eligible to
     participate  in the  Plan:  (i) any  person  who is not a  Director  of the
     Company as of December 16, 1999 ("Future  Directors");  and (ii) any person
     who is a Director of the  Company as of  December  16, 1999 and who has not
     completed  six years of  service  as a  Director  and who is not  therefore
     eligible  as of  December  16,  1999 to  participate  in the Plan  (meaning
     Messrs. DeBenedictis,  Morgan, Morris, and Nicholas)(collectively hereafter
     referred  to as  "Ineligible  Directors"),  subject  to the  grant  to such
     persons  (with the  exception of Mr.  Morgan) of stock options equal to the
     present  value of the  accrued  retirement  benefit,  and subject as to Mr.
     Morgan to the establishment of a "Restoration  SERP", with compensation for
     such  Ineligible  Directors for future service as a Director of the Company
     to be on such terms as the Board may from time to time determine.

          In addition,  effective as of December 16, 1999, existing non-employee
     Directors  who have  completed  six years of service and who are  therefore
     eligible  as of  December  16,  1999 to  participate  in the Plan  (meaning
     Messrs. Hayes and Lawley) may elect to be compensated for future service as
     a Director of the Company in part either by participation in the Plan or on
     such terms as the Board may from time to time determine,  and, in the event
     of such latter  election,  the amount and number or years of the Retirement
     Payments  payable under Section 4 of the Plan shall be determined and fixed
     as of December 16, 1999.  Any such  election  shall be made by such persons
     prior to January 16, 2000.

          In addition,  effective as of December  16,  1999,  existing  employee
     Directors  who have  completed  six years of service and who are  therefore
     eligible as of December 16, 1999 to  participate  in the Plan  (meaning Mr.
     Kacin) shall be compensated for future service as a Director of the Company
     in part by  participation  in the Plan and on such other basis as the Board
     may from time to time determine.



                                       -1-

<PAGE>

          This  amendment  to  Section  3 shall  effect  no  change  for  former
     Directors currently receiving Retirement Payments under the Plan."

     IN WITNESS  WHEREOF,  the  Company  has caused  its  authorized  officer to
execute this Amendment on behalf of the Company.


         WITNESS                             MET-PRO CORPORATION


/s/ William L. Kacin                         By: /s/ Gary J. Morgan
---------------------------                      -------------------------------
William L. Kacin                                 Gary J. Morgan
                                                 Vice President - Finance