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--Ty-- t1_isvihlz wrote

You sure there's no access panel hidden somewhere that reveals the valve? The basement finishers would have to be phenomenally stupid to cover something like that without providing an access panel.

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ST3AM3D_HAMS t1_it0cgl6 wrote

I'm sure. There no access panels in the drywall, nor any valves in the furnace room where the main waterline splits off

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--Ty-- t1_it0gjsn wrote

Damn. Well, in terms of figuring out which line leads to the spigot, and only the spigot, I have no idea how that would be possible without removing drywall to get a look.

r/Plumbing may know of some more advanced techniques to sound the line.

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