Thanks. I understand the story better now. Your original post did start
out saying "to replace the main valve", which I took to be the entire
valve, "body, stem (and sinker)".
So, it's then possible that the first guy put in an incorrect part and
didn't notice that something wasn't fitting correctly, though I would
have thought he'd stick around for a minute or two after he opened it to
to look at it and notice it was dripping.
(Or maybe he left it closed 'cause you were leaving your place
momentarily and when you came back and opened it that's when the
Good luck, I think contacting your homeowner's insurer would be a wise
thing to do.
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