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Watts
Plumbing

Model # 1790 Official Watts 1" water pressure reducing valve

Here are the diagrams and repair parts for Official Watts 1790 1" 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  |
Union Nut 35C140
#21C

Replacement parts diagram

Union nut

Part #35C140

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

Lock Nut 30AL51
#7

Replacement parts diagram

Lock nut

Part #30AL51

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

Diagram 135A20
#10A

Replacement parts diagram

Diagram

Part #135A20

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

Plate 135B66-M2
#9B

Replacement parts diagram

Plate

Part #135B66-M2

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

Gasket 1-1/16X1-1/4
#18B

Replacement parts diagram

Gasket

Part #1-1/16X1-1/4

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

Union Tailpc 135C139
#23C

Replacement parts diagram

Union tailpc

Part #135C139

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

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