FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: January 31, 2005 Estimated average burden hours per response... 0.5

(Print or Type Responses)

1. Name and Address of Reporting Person * SCHROCK MICHAEL V   2. Issuer Name and Ticker or Trading Symbol PENTAIR INC [PNR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) President, COO Enclosures (Last) (First) (Middle) 5500 WAYZATA BLVD., SUITE 800 3. Date of Earliest Transaction (Month/Day/Year) 03/02/2005 (Street) GOLDEN VALLEY, MN 55416-1261 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 03/02/2005   M   16,668 A $ 16.5625 201,562.191 D   Common Stock 03/02/2005   M   68,000 A $ 18.1485 269,562.191 D   Common Stock 03/02/2005   M   42,666 A $ 17.47 312,228.191 D   Common Stock 03/02/2005   M   14,398 A $ 22.88 326,626.191 D   Common Stock 03/02/2005   F   94,414 D $ 41.43 232,212.191 D   Common Stock 03/03/2005   S   100 D $ 41.5 232,112.191 D   Common Stock 03/03/2005   S   11,000 D $ 41.52 221,112.191 D   Common Stock 03/03/2005   S   6,200 D $ 41.54 214,912.191 D   Common Stock 03/03/2005   S   399 D $ 41.56 214,513.191 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
	Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.		SEC 1474 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Employee Stock Option (right to buy)

$ 16.5625

03/02/2005

M

16,668

10/22/2002

10/22/2011

Common Stock

16,668

$ 0

0

D

Employee Stock Option (right to buy)

$ 17.47

03/02/2005

M

42,666

01/02/2004

01/02/2013

Common Stock

42,666

$ 0

21,334 (1)

D

Employee Stock Option (right to buy)

$ 18.1485

03/02/2005

M

68,000

01/02/2003

01/02/2012

Common Stock

68,000

$ 0

0 (1)

D

Employee Stock Option (right to buy)

$ 22.88

03/02/2005

M

14,398

01/02/2005

01/02/2014

Common Stock

14,398

$ 0

73,602 (1)

D

Employee Stock Option (right to buy)

$ 41.43

03/02/2005

A(2)

6,662

03/02/2005(3)

10/22/2011(3)

Common Stock

6,662

$ 0

6,662

D

Employee Stock Option (right to buy)

$ 41.43

03/02/2005

A(2)

29,786

03/02/2005(3)

01/02/2012(3)

Common Stock

29,786

$ 0

29,786

D

Employee Stock Option (right to buy)

$ 41.43

03/02/2005

A(2)

17,991

03/02/2005(3)

01/02/2013(3)

Common Stock

17,991

$ 0

17,991

D

Employee Stock Option (right to buy)

$ 41.43

03/02/2005

A(2)

7,951

03/02/2005(3)

01/02/2014(3)

Common Stock

7,951

$ 0

7,951

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
SCHROCK MICHAEL V 5500 WAYZATA BLVD. SUITE 800 GOLDEN VALLEY, MN 55416-1261			President, COO Enclosures

Signatures

Louis L. Ainsworth, Attorney-In-Fact		03/04/2005
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	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 stock option and exercise price have been adjusted to reflect the stock split.
(2)	Employee reload stock option granted pursuant to the Pentair, Inc. Omnibus Stock Incentive Plan.
(3)	Reload stock option becomes exercisable upon grant and expires on the same date as the original option grant.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.