PENTAIR plc — Director's Dealing 2006

May 15, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: PENTAIR INC (PNR)
CIK: 0000077360
Period of Report: 2006-05-12

Reporting Person: Dempsey Jack J (Sr. VP, Operations/Technology)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2006-05-12	Common Stock - ESPP	A	12.558	$37.328	Acquired	12.558	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	29076.665	Direct
Common Stock	67	Indirect

Footnotes

F2: Purchase of shares under the Pentair, Inc. Employee Stock Purchase Plan in exempt transaction pursuant to Rule 16b-3(c).

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

F3: 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.