Step 3 · Access the Plumbing
To access the plumbing, you will need to cut an opening in the wall. First, use a stud finder to locate the studs on either side of the existing plumbing. Mark the area you need to cut. The opening should be large enough to comfortably work on the plumbing and will be centered on the valves. For a tiled wall, use an angle grinder with a diamond blade to carefully cut through the tile and grout along your marked lines. Then, switch to an oscillating multi-tool or drywall saw to cut through the drywall or cement board behind the tile. Be extremely careful not to cut too deep and damage any pipes or electrical wires inside the wall.