Step 5 · Prepare and Dry-Fit New Valve
Prepare the cut ends of the existing copper pipes. Use a deburring tool to smooth the inside edge of each pipe, then thoroughly clean the outside of the pipes (about 1 inch from the end) with sand cloth or a fitting brush until they are bright and shiny. Do the same for the inside of the new copper fittings. Temporarily assemble the new valve with any necessary couplings and pipes (this is called 'dry-fitting'). Use the manufacturer's included plaster guard or template to position the valve at the correct depth relative to the front surface of the tile. Secure the valve to the wood stringer in the wall with screws.