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Watts 1790 1" water pressure reducing valve Parts
Here are the diagrams and repair parts for Watts 1790 1" water pressure reducing valve, as well as links to manuals and error code tables, if available.
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Browse Parts for 1790 1" Water Pressure Reducing Valve
Replacement parts diagram
Plate
Part #135B66-M2
The manufacturer no longer makes this part, and there's no substitute part
Replacement parts diagram
Lock Nut
Part #30AL51
The manufacturer no longer makes this part, and there's no substitute part
Replacement parts diagram
Spring Cage
Part #135A3-M3
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Service Kit
Part #5C
The manufacturer no longer makes this part, and there's no substitute part
Replacement parts diagram
Spring
Part #254
The manufacturer no longer makes this part, and there's no substitute part
Replacement parts diagram
Strainer
Part #4500A77
The manufacturer no longer makes this part, and there's no substitute part
Replacement parts diagram
Gasket
Part #1-1/16X1-1/4
The manufacturer no longer makes this part, and there's no substitute part
Replacement parts diagram
Strain Plug
Part #18Y2
The manufacturer no longer makes this part, and there's no substitute part
Replacement parts diagram
Union Nut
Part #35B140
The manufacturer no longer makes this part, and there's no substitute part
Replacement parts diagram
Stem & Seal
Part #SA-50C27
The manufacturer no longer makes this part, and there's no substitute part
Most common symptoms to help you fix your heating & cooling combined units
Choose a symptom to see related heating and air conditioning system repairs.
Thermostat problems, bad compressor/condenser fan capacitor, lack of refrigerant, failed compressor…
Dirty air filter, clogged condenser coils, low refrigerant charge, faulty compressor…
Thermostat problem, clogged air filter, burner failure…
Main causes: errant thermostat settings, lack of electrical power, clogged drain line, wiring failure, control failure.…
Main causes: Errant thermostat settings, lack of power, bad interlock switches, lack of exhaust ventilation, wiring fail…
Dirty flame sensor, failed flame sensor, damaged burner, bad high limit switch…
Most common repair guides to help fix your heating & cooling combined units
These step-by-step repair guides will help you safely fix what’s broken on your HVAC system.
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Repair time and Difficulty
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The flame sensor detects when furnace burner flames are lit. You may need to replace the flame sensor if flames only sta…
Repair time and Difficulty
15 minutes or less
How to replace a heating and air conditioning system thermostat
The control thermostat for your HVAC system can stop working. This repair guide shows how to replace it.…
Repair time and Difficulty
30 minutes or less
Effective articles & videos to help repair your heating & cooling combined units
Use the advice and tips in these articles and videos to get the most out of your HVAC system.
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