Exhibit 10(d)

                                 AMENDMENT NO. 1
                                     TO THE
                   MET-PRO CORPORATION 1997 STOCK OPTION PLAN

This amendment to the Met-Pro Corporation 1997 Stock Option Plan (the "Plan") is
made and approved this 4th day of April, 2001.

WHEREAS,  the  Board  of  Directors  has  adopted  the  Plan,  and the  Plan was
thereafter approved by the stockholders on June 4, 1997.

WHEREAS,  Section 15 of the Plan  authorizes the Board of Directors to amend the
Plan.

WHEREAS, the Board of Directors has previously amended the Plan by action of the
Board to provide for an extended exercise date for certain  non-qualified  stock
options following the retirement of certain non-employee Directors.

WHEREAS,  the Board now desires to amend the Plan generally to provide the Board
with the  authority to determine  the  expiration  date of  non-qualified  stock
options following the cessation of services by optionholders  under the Plan, as
well as to grant the Board with the  authority to determine  the manner in which
payment of the exercise price may be made.

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

     1.   The Board ratifies action previously taken by the Board with regard to
          an extended  expiration  date of certain  non-qualified  stock options
          granted to certain  non-employee  Directors following their retirement
          from the Board.

     2.   Section 7(c) of the Plan is hereby deleted.

     3.   A new Section 7(c) is hereby added to the Plan as follows:

          "(c) A Nonstatutory Stock Option granted under the Plan may be of such
          duration,  not longer than ten (10) years,  as shall be  determined by
          the  Committee,  and shall be subject to such earlier  termination  as
          determined from time to time by the Board."

     4.   The  provisions  of  Section  10  shall  not be  deemed  to  apply  to
          non-statutory  stock  options,  and shall be  deemed to apply  only to
          incentive stock options.  Any references in Section 10 to non-employee
          Directors shall be deemed stricken and shall be of no effect.

     5.   Section  11 (b) (ii) is  amended  to  delete  the word "or" at the end
          thereof; Section 11 (b) (iii) is amended to substitute the period with
          which it ends with a  semicolon,  and to add the word  "or"  following
          such semicolon; and a new Section 11 (b)(iv) is added as follows:

          "(iv) By such  other  means of  payment  as the Board may from time to
          time determine."

     Except as  expressly  provided for herein,  the Plan as amended  remains in
     force and effect, unamended and unmodified.

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


         WITNESS                             MET-PRO CORPORATION


                                             By: /s/ William L. Kacin
---------------------------                     --------------------------------
                                                William L. Kacin
                                                Chief Executive Officer