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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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Model diagram and schematic

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Showing 10 of 45 parts  |
Diagram 135A20
#10A

Replacement parts diagram

Diagram

Part #135A20

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

Washer 45A62
#4

Replacement parts diagram

Washer

Part #45A62

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

Spring Cage 135A3-M3
#3A

Replacement parts diagram

Spring cage

Part #135A3-M3

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

Gasket 1-1/8X1-3/8
#16B

Replacement parts diagram

Gasket

Part #1-1/8X1-3/8

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

Disc 50B37
#14A

Replacement parts diagram

Disc

Part #50B37

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

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

Lock Nut 30AL51
#7

Replacement parts diagram

Lock nut

Part #30AL51

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

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