Step 4 · Remove Old Shower Valve
With the valve exposed, identify the hot inlet, cold inlet, shower riser (to showerhead), and tub spout outlet pipes. Take a photo for reference. Using a compact tubing cutter, cut each of the copper pipes connected to the old valve. Make your cuts in a straight, accessible section, leaving as much pipe as possible to work with for the new installation. Once all pipes are cut, unscrew or pry the old valve body from the wood stringer it's mounted to inside the wall and remove it.