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Monday, October 24th 2016, 8:20am

Wilkins 975XL - Flow Problem - NO Leaks

I have a Wilkins 975xl backflow preventer. It is removed every winter and passes its test before every spring. That said - my sprinkle output is very weak. Each time I run the sprinklers I have to shut off the water coming from the Wilkins and open the three relief valves. This can be done in any order - once all three are open - I shut them off one at a time - open the water valve back up - and my sprinklers run just fine.....

Once done all 5 zones run normally. There are no visible leaves from the preventer.



Supreme Member

Posts: 5,287

Location: Metro NYC


Tuesday, October 25th 2016, 8:44am

You are probably going to have to get used to rebuilding that RPZ on a regular basis. Hard water buildups will jam the poppets and/or limit their movement.

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