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This Pressure Vacuum Breaker is between the city meter and the house. Usually when the layout is this way. If I shut these two valves off, does it stop the supply of water to the sprinkler system or the entire house?

  • 1
    it should only be for the irrigation system. you should have a backflow preventer inside your house. Dec 19, 2022 at 3:26
  • why ask here? ... just turn off the valves and see if your house still gets water
    – jsotola
    Dec 19, 2022 at 7:40

1 Answer 1


Normally I would expect it to be for the sprinkler system but you never know. There is a valve on it, turn it off and then try the faucets etc in your home. If they quit it is a main cutoff, if they keep working it is for the sprinklers which at this point with the valve off they will not work.

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