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Yup box with a red x. If you want to post a picture you need to post it at a site that allow direct linking not one that requires you to log in.
 

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My guess would be a automatic shutoff in the event of an open line???? The long gadget below is a pressure or flow monitor, not sure about the thing with all the wires, an shutoff valve??
 

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Tired & Dirty
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I agree with Bill, looks to be a shut off of some kind to me, need some more pics of the sides and back maybe.
Was just giving ya a hard time about the X in box thing, posting pics can be a real pain sometimes.
 

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Is this on the water supply to the house? It looks like it might be part of a hydronic heating system. It could be a zone valve to shut off that zone. It could be a whole house shutoff in case of a leak.
 

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Drywall contractor
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Looks kinda scary whatever it is...
 

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Where do all the wires go?
Ron
 

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Discussion Starter #11
The thing is on the incoming supply line - so you see it right after the pressure regulator. The wires are unhooked and just left in place on the stud - where they went would have helped I know.

Stumped me.... I suppose it may end up being one of those mysteries but it sure had me curious...
 

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I will guess.

The round thing looks like a solonoid valve. Does the black thing have two wires coming out of it?

The box installed on the skinny pipes is probably a pressure gauge.

I am thinking that, when wired up and turned on, the pressure gauge would sense a drop in pressure and activate the solonoid valve to shut off the water.
 

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Discussion Starter #13
Three wire out of the box which has air tubes on it also. The grey wire is just hanging down - looks like it hooked in where you see the wire nuts.

I'm thinking the guess about some auto shut off is right....
 

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Since you're asking I'm guessing you didn't install it so this won't hurt your feelings, but it looks like a rats nest of wiring with a stem that could snap off too easily so protect it but leave it accessable.
I would tidy up and twist that wiring where the blue connectors are and pull that wire at least 6" back above if possible from any pipe connections then clamp with a nylon cable tie, not tape. Wires look like low v signal wiring perhaps to an external sensor?????
 
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