PENTAIR plc — Director's Dealing 2010

May 17, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: PENTAIR INC (PNR)
CIK: 0000077360
Period of Report: 2010-05-14

Reporting Person: MONAHAN WILLIAM T (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-14	Common Stock	M	12.217	$0.00	Acquired	21862.432	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-05-14	Phantom Stock Units (Deferred Compensation)	$1.00	M	12.217	Disposed		Common Stock (12.217)	Indirect

Footnotes

F1: Upon settlement of phantom stock units, underlying securities held directly by reporting person.

F2: 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: Phantom stock units convert into common stock on a one-for-one basis.

F4: Settlement of phantom stock units in accordance with reporting person's irrevocable election.