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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

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Showing 10 of 45 parts  |
Gasket 215Y102
#18A

Replacement parts diagram

Gasket

Part #215Y102

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

Diagram 135B20
#10B

Replacement parts diagram

Diagram

Part #135B20

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

Spring 124
#5A

Replacement parts diagram

Spring

Part #124

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

Gasket 1-1/2X1-3/4
#16A

Replacement parts diagram

Gasket

Part #1-1/2X1-3/4

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

Seat 50C16
#12B

Replacement parts diagram

Seat

Part #50C16

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

Plug 37A2-1
#19B

Replacement parts diagram

Plug

Part #37A2-1

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

Disc Holder 50C47
#15B

Replacement parts diagram

Disc holder

Part #50C47

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

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