PENTAIR plc — Director's Dealing 2005

May 5, 2005

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: PENTAIR INC (PNR)
CIK: 0000077360
Period of Report: 2005-05-04

Reporting Person: AINSWORTH LOUIS L (Sr. Vice President, Secretary)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2005-05-04	Common Stock	G	300	—	Disposed	109218.159	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	3180.006	Indirect
Common Stock - ESOP	1446.4609	Indirect

Footnotes

F1: End-of-period holdings include ESOP allocation and shares acquired under a dividend reinvestment plan in exempt transactions not required to be reported pursuant to Section 16(a).