8 votes
Accepted

backflow-preventer valve: "shall provide protection where a potential health hazard does not exist": can it be used in a house?

Levels of hazard The US plumbing codes call out different backflow preventers for different applications based on the level of risk involved. Your dual check valve is intended for lower-hazard ...
ThreePhaseEel's user avatar
4 votes

Do individual irrigation system branch pipes need backflow preventers?

The instructions probably state the need for backflow prevention assuming there is none existing. ( probably legally motivated) If you have backflow prevention on the main line to the system manifold ...
RMDman's user avatar
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4 votes

backflow-preventer valve: "shall provide protection where a potential health hazard does not exist": can it be used in a house?

Well, anything can be a potential health hazard, including unpolluted dihydrogen monoxide. I suspect that this language is trying to say is: This valve prevents normal usage from backing up into the ...
manassehkatz-Moving 2 Codidact's user avatar
3 votes
Accepted

Should I leave main water off after my back flow preventer broke?

Turning off the valve that supplies the water to the backflow preventer isolates the water going into your home. You're safe. The BFP when functioning properly allows water to be fed to the sprinkler ...
RMDman's user avatar
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2 votes
Accepted

Remove leaky backflow preventer

When removing threaded plumbing you need to use two wrenches. One to hold and one to turn. Place the holding wrench as close to the wall as you can to prevent pipe bending. If you have to, remove the ...
Traveler's user avatar
  • 17k
1 vote

Why is my lawn sprinkler backflow preventer failing?

It sounds like you have a blockage in that zone and the water is dispersed through the backflow. Try taking the heads off at the beginning of the zone. Also look for damp ground where a brake may ...
RMDman's user avatar
  • 27.2k

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