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Technically it's a valve not a fixture but that won't stop your insurance company from trying to classify it as a fixture. I'd suggest you call the insurance company and ask them how they would classify the tub valve. There's not much point in trying to find parts for this valve. Even if you can replace the washers the seats (what the washer compresses against) are probably bad too and no way you find seats for a 60 year old tub valve. The best course of action is to just replace the valve. This can be done without destroying the wall. We use a cover plate (see attached pic) that allows for a hole big enough to work through from the tub side. Then the plate covers the hole.