I have a very old bath/shower faucet that I can't get it to completely stop dripping, no matter what position I close it in. The best way to explain it is like a joystick. You push it up to turn it on, left to make it warmer, right to make it colder. It has what I would call a sheath that goes around all of the internals. I know if I can get it taken apart I can replace a gasket or something, but I have no idea what part number this faucet is.