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: HARRISON DAVID D (Executive Vice President, CFO)

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 54,484 shares directly; and 309.9675 indirectly by ESOP. ESPP and ESOP balances include shares acquired under the Pentair, Inc. Dividend Reinvestment Plan in exempt transaction not required to be reported pursuant to Section 16(a).