Step 4 · Disconnect and Remove Old Valve
With the valve exposed, identify the hot, cold, and shower riser pipes. Use a tubing cutter to make clean cuts on all three pipes, leaving as much pipe stub as possible extending from the wall fittings. A mini tubing cutter may be necessary for tight spaces. Once the pipes are cut, locate the screws that secure the old valve body to the wooden support (stringer) inside the wall and remove them with a screwdriver. The old valve should now be free to be pulled out of the wall.