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Watts
Plumbing

Model # 1788 Official Watts 1/2" water pressure reducing valve

Here are the diagrams and repair parts for Official Watts 1788 1/2" water pressure reducing valve, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Error Codes

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Showing 10 of 45 parts  |
Disc 50C37
#14B

Replacement parts diagram

Disc

Part #50C37

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

675.4 (1/2") 56C8102
#22A

Replacement parts diagram

675.4 (1/2")

Part #56C8102

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

Union Nut 35B140
#21B

Replacement parts diagram

Union nut

Part #35B140

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

Union Tailpc 135B139
#23B

Replacement parts diagram

Union tailpc

Part #135B139

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

Service Kit 5C

#NI

All parts diagram

Service kit

Part #5C

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

Union Seal 35C103
#22C

Replacement parts diagram

Union seal

Part #35C103

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

Service Kit 5B

#NI

All parts diagram

Service kit

Part #5B

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

Union Tailpc 135A139
#23A

Replacement parts diagram

Union tailpc

Part #135A139

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

Strainer 27Y77
#20A

Replacement parts diagram

Strainer

Part #27Y77

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

Union Nut 35A140
#21A

Replacement parts diagram

Union nut

Part #35A140

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

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