Take the faucet to a plumbing supply Shower Faucets store and match the tube length with a new one. Install a new faucet by putting 3 wraps of teflon tape around the threads on the valve, screwing it into the threads of the fitting inside the wall and tightening it. Make sure that the faucet slopes slightly to the outside of the house so it will faucet when it is shut off.Remove the faucet by putting a wrench on the Bathtub Faucets and unscrewing it from its connection behind the wall.