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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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  • 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

Model diagram and schematic

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Showing 10 of 45 parts  |
Union Nut 35A140
#21A

Replacement parts diagram

Union nut

Part #35A140

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

Strain Plug 18Y2
#19A

Replacement parts diagram

Strain plug

Part #18Y2

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

Seat 50B16
#12A

Replacement parts diagram

Seat

Part #50B16

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

Lock Washer 174C46
#8

Replacement parts diagram

Lock washer

Part #174C46

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

Union Nut 35B140
#21B

Replacement parts diagram

Union nut

Part #35B140

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

Stem & Seal SA-50C27
#11B

Replacement parts diagram

Stem & seal

Part #SA-50C27

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

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