You can try to rebuild it, but it is not worth my time to do it, since it could cost the customer more to take it apart and redo it, plus the parts, than it would for me to purchase a new valve and install it.

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I have a Watts pressure reducer model N35B 25 to 75 lb range. I can purchase a rebuild kit $20 or buy a new one $60. The Rebuild seems easier since I assume I just replace the internal parts. Is it just as simple as removing the top and placing new parts in. New one would require more plumbing Knowlege since it screws on from both sides. The problem is the pressure creeps up after the water flow is stopped. I am at 100 psi in an hour.Use a little water and it is back to 50 lbs and it creaps up again slowly. Post Edited

Does the prv have a built in union? What kind of pipe is it copper, plastic or steel? If copper, you can cut the downstream side and back out the male adapters. Then sweat a coupling or use a compression union. Peace out, Kordts

The Birko 1311125 vent over flow switch senses the temperature of hot water flowing out the vent waste tube and cuts the main water feed off once the temperature reaches 90 degrees once tripped the switch can be manually reset after temperature has dropped.

Mineral deposits usually found in municipal water supplies crust up the insides of these valves so bad that a rebuild is frequently unsuccessful.

Temperature: 90 degrees Celsius cutout Suits Parts Numbers Birko 1311125 Birko 1311022 old part number Manual reset switch 90c N/C contact 16 amp Suits 2.5 to 25lt models

The Birko 1311125 vent over flow switch senses the temperature of hot water flowing out the vent waste tube and cuts the main water feed off if over 90c

I have a watts N35B that is 24 years old. I would get 120 PSI in the house and my flow rate at the hose bib was 5 gpm. the pressure would not change when I screwed it in or out. I took it apart. Tons of crap inside. I rebuilt it, cleaning everything, replacing the dried out o rings and washer with ones that I had on hand. The Diaphram was still usable so I reused it. ( I can order one and replace that later ) Put everything back together works just fine. set it at 80 PSI, and get 10 gpm flow rate Look up the regulator diagram on the watts web site. the only specialty tool was a 1 1/8" socket to remove the valve core.

I bought 10 of the Watts N35 and 3 of them did exactly like you described. I went back to the Watts 25 AUB and never have a problem. They cost a bit more however. - - - - - - - - - - - - - - - - - - - - Since 1995 (3 years before Google started) PlumbingSupply.com has been THE best plumbing supplier on the web. Please visit our sponsor [www.PlumbingSupply.com]