Step 4 · Remove Old 3-Handle Valve Body
With the valve exposed, identify the hot water pipe, cold water pipe, and the shower riser pipe leading up to the shower head. Using a compact tubing cutter, cut each of these three copper pipes, leaving several inches of pipe extending from the wall fittings to work with. If the old valve is secured to a wood block, unscrew it. Once the pipes are cut and any mounting screws are removed, the entire 3-handle valve assembly can be pulled out of the wall cavity.