It's hard to tell what's coming out of the wall...if it is a threaded connection, a screw-on shutoff should work. If that elbow is soldered, then that won't work. If there's enough sticking out (doesn't look like, it), you could cut it off and put a compression valve on that stub. Otherwise, a compression on that copper stub that is vertical, or it if has a threaded adapter soldered onto it, a new threaded shut off there.





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