Help to identify

[cglochau]

I touched it and it fell off (not properly secured) water under pressure came out. I shut the water off put it back in place turned the water on and water was flowing through it. I turned the hose bib next to it on and then off and the water stoped flowing through it. Is it some kind of pressure relief valve for the whole house?







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[Dom D'Agostino]

Yes, PRV for the plumbing system. Typically installed in one of two locations here In FLA.
Above the water heater, or near the main water service entrance.

Dom.

[cglochau]

Thanks for the info. Just don't know why its on this 2007 cookie cutter. With county water.