Step 3 · Remove Old Faucet and Valve
First, from the front, use a screwdriver to remove the three faucet handles and the trim plates (escutcheons). Now, working through the access hole, identify the hot, cold, and shower riser pipes connected to the old valve. Since the pipes are copper, use a compact tubing cutter to make clean cuts on the straight sections of the pipes leading into the old valve body. Leave as much pipe as possible to work with. Once all pipes are cut, the old valve body should be loose. If it is screwed to a support block, remove the screws and pull the old valve out of the wall.