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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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  • 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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ALL PARTS
Showing 10 of 45 parts  |
Strain Plug 18Y2
#19A

Replacement parts diagram

Strain plug

Part #18Y2

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

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

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

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

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

Lock Nut 30AL51
#7

Replacement parts diagram

Lock nut

Part #30AL51

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

Lock Washer 174C46
#8

Replacement parts diagram

Lock washer

Part #174C46

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

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