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Watts
Plumbing

Model # 1789 Official Watts 3/4" water pressure reducing valve

Here are the diagrams and repair parts for Official Watts 1789 3/4" water pressure reducing valve, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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Showing 10 of 45 parts  |
Owner's Manual F642-16375

#NI

All parts diagram

Owner's manual

Part #F642-16375

The manufacturer no longer makes this part, and there's no substitute part

Strainer 4500A77
#20B

Replacement parts diagram

Strainer

Part #4500A77

The manufacturer no longer makes this part, and there's no substitute part

Plug N36A2
#17A

Replacement parts diagram

Plug

Part #N36A2

The manufacturer no longer makes this part, and there's no substitute part

Service Kit 5A

#NI

All parts diagram

Service kit

Part #5A

The manufacturer no longer makes this part, and there's no substitute part

Stem & Seal SA-50B27
#11A

Replacement parts diagram

Stem & seal

Part #SA-50B27

The manufacturer no longer makes this part, and there's no substitute part

Disc Holder 50B47
#15A

Replacement parts diagram

Disc holder

Part #50B47

The manufacturer no longer makes this part, and there's no substitute part

Diagram 135B20
#10B

Replacement parts diagram

Diagram

Part #135B20

The manufacturer no longer makes this part, and there's no substitute part

Disc Holder 50C47
#15B

Replacement parts diagram

Disc holder

Part #50C47

The manufacturer no longer makes this part, and there's no substitute part

Spring 254
#5B

Replacement parts diagram

Spring

Part #254

The manufacturer no longer makes this part, and there's no substitute part

Adjusting Screw (3/8-16 X 2") N/P
Adjusting screw (3/8-16 x 2")

Part #N/P

The manufacturer no longer makes this part, and there's no substitute part

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