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Tried wd-40, liquid wrench, engine degreaser, stem socket wrench, heat, hammer and chisel. Nothing works. Cold side came off. Looks like some kind of sealant was applied. Corners of stem socket stripped.

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  • possible left hand thread – jsotola Jul 27 '19 at 1:42
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    Damn... real big pipe wrench and be prepared to buy a new stem. Be careful, it is possible to tweak the valve-body/pipes in the wall. You might start figuring out how to open up that wall (maybe from the back side?) to replace the whole unit... – Jimmy Fix-it Jul 27 '19 at 3:40
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I second (or third) the pipe wrench solution. However, I would add that you should be prepared for worst case scenario, which includes damaging the valve, and possible the solder that connects the piping to the valve.
Good luck.

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At this point I think a pipe wrench is in order. Nothing else will grab what's left of the valve. Even if you do get it out finding a replacement stem might be tough. Maybe time to update to a new valve. Good luck.

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