EXHIBIT 32.2

                    CERTIFICATION OF CHIEF FINANCIAL OFFICER

      Pursuant to 18 U.S.C. Section 1350, as created by Section 906 of the
Sarbanes-Oxley Act of 2002, the undersigned officer of IDEX Corporation (the
"Company") hereby certifies, to such officer's knowledge, that:

            (i) the accompanying Quarterly Report on Form 10-Q of the Company
            for the quarterly period ended June 30, 2007 (the "Report") fully
            complies with the requirements of Section 13(a) or Section 15(d), as
            applicable, of the Securities Exchange Act of 1934, as amended; and

            (ii) the information contained in the Report fairly presents, in all
            material respects, the financial condition and results of operations
            of the Company.

      August 6, 2007                  /s/ Dominic A. Romeo
                                      --------------------------------
                                      Dominic A. Romeo
                                      Vice President and Chief Financial Officer