PENTAIR plc — Director's Dealing 2003

May 13, 2003

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: PENTAIR INC (PNR)
CIK: 0000077360
Period of Report: 2003-05-09

Reporting Person: CATHCART RICHARD J (President, COO Water Tech.)

Footnotes

F1: Purchase of shares under the Pentair, Inc. Employee Stock Purchase Plan in exempt transaction pursuant to Rule 16b-3(c).

F2: Shares acquired under this Plan are purchased over a three-day trading period. The price shown is the average purchase price over the trading period.

F3: Reporting person also holds 47,404.558 shares directly; 758.162 indirectly by children; 1,802.4042 indirectly by ESOP. Balances include shares acquired under the Pentair, Inc. Dividend Reinvestment Plan in exempt transactions not required to be reported pursuant to Section 16(a).