PENTAIR plc — Director's Dealing 2005

May 3, 2005

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: PENTAIR INC (PNR)
CIK: 0000077360
Period of Report: 2005-05-02

Reporting Person: MEOZZI AUGUSTO (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2005-05-02	Common Stock	M	1300	$11.375	Acquired	4171	Direct
2005-05-02	Common Stock	M	2300	$18.1485	Acquired	6471	Direct
2005-05-02	Common Stock	M	3043	$19.5391	Acquired	9514	Direct
2005-05-02	Common Stock	F	4001	$40.38	Disposed	5513	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2005-05-02	Nonqualified Stock Option (right to buy)	$11.375	M	1300	Disposed	2011-01-02	Common Stock (1300)	Direct
2005-05-02	Nonqualified Stock Option (right to buy)	$18.1485	M	2300	Disposed	2012-01-02	Common Stock (2300)	Direct
2005-05-02	Nonqualified Stock Option (right to buy)	$19.5391	M	3043	Disposed	2012-02-27	Common Stock (3043)	Direct
2005-05-02	Nonqualified Stock Option (right to buy)	$40.38	A	366	Acquired	2011-01-02	Common Stock (366)	Direct
2005-05-02	Nonqualified Stock Option (right to buy)	$40.38	A	1033	Acquired	2012-01-02	Common Stock (1033)	Direct
2005-05-02	Nonqualified Stock Option (right to buy)	$40.38	A	1472	Acquired	2012-02-27	Common Stock (1472)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	400	Indirect

Footnotes

F1: On May 17, 2004, Pentair declared a 2-for-1 stock split in the form of a 100 percent stock dividend payable on June 8, 2004, to shareholders of record as of June 1, 2004. This previously reported derivative security has been adjusted to reflect the stock split.

F2: Non-qualified reload stock option granted under the Pentair, Inc. Outside Directors Non-Qualified Stock Option Plan.

F3: Reload stock option becomes exercisable upon grant and expires on the same date as the original option grant.