Can’t find your part?   Contact us:
+1-309-603-4777
Sears Parts Direct
Orders

  • Keep track of the models you own in your profile

    Sign in or Register to view or add models

Schedule a repair
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.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • 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”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
ALL PARTS
Showing 10 of 45 parts  |
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 Seal 35C103
#22C

Replacement parts diagram

Union seal

Part #35C103

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

Adjustment Nut 30B33
#2

Replacement parts diagram

Adjustment nut

Part #30B33

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

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

Service Kit 5A

#NI

All parts diagram

Service kit

Part #5A

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

Disc 50C37
#14B

Replacement parts diagram

Disc

Part #50C37

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

Most common symptoms to help you fix your range hoods

Choose a symptom to see related range hood repairs.

View all

Why doesn't my range hood's fan work?

Main causes: bad fan switch, electronic control board failure, faulty user interface control, wiring failure…

Read more

Why don't my range hood's lights work?

Main causes: bad light bulb, broken light switch, bad electronic control, user interface control failure, bad light sock…

Read more

Why does my range hood's fan turn on by itself?

Main causes: sentry feature trips due to high cooktop temperature, bad temperature sensor, electronic control board fail…

Read more

Why doesn't my range hood work?

Main causes: lack of electrical power, bad electronic control board, faulty user interface, fan and light switch failure…

Read more

Why isn't my range hood's fan pulling much air?

Main causes: clogged air filters, air duct problems, fan motor failure, broken fan blade…

Read more

Why is my range hood's exhaust fan noisy?

Main causes: loose mounting screws, bad fan motor, damaged fan blade, worn fan motor bearings…

Read more

Why don't my range hood's lights and fan work?

Main causes: electronic control board failure, bad user interface control, light and fan switch failures, wiring failure…

Read more

Most common repair guides to help fix your range hoods

These step-by-step repair guides will help you safely fix what’s broken on your range hood.

View all
How to replace a range hood fan motor

How to replace a range hood fan motor

If the fan on the range hood won’t run, it’s likely that the fan motor has failed. Follow the steps in this guide to rep…

Read more
Repair difficulty
Time required
 30 minutes or less
How to replace a range hood fan switch

How to replace a range hood fan switch

The fan switch activates the fan motor in the range hood. If the fan switch is defective, replace it using the detailed …

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a range hood light socket

How to replace a range hood light socket

When you replace a light bulb and it still won’t work, the socket is likely defective. Use the detailed steps in this re…

Read more
Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your range hoods

Use the advice and tips in these articles and videos to get the most out of your range hood.

View all
Wiring schematic symbols explained video

Wiring schematic symbols explained video

Learn some of the most common symbols found in a wiring diagram and what they mean.…

Read more
How to repair broken or damaged wires video

How to repair broken or damaged wires video

Learn how to repair broken, frayed or damaged wires in your appliances.…

Read more
How to use a multimeter to test electrical parts video

How to use a multimeter to test electrical parts video

Learn how to use a multimeter to check for wiring problems in an appliance that's not working…

Read more

Parts & More