Step 7 · Install New Faucet Trim
With the plumbing confirmed to be leak-free, you can install the new faucet trim from the shower side. Re-install the cartridges or stops into the valve body if you removed them for soldering. Slide the new escutcheons over the valve stems and secure them to the wall. Apply a bead of silicone caulk around the top and sides of the escutcheons to prevent water from getting behind them, but leave the bottom open to allow any trapped moisture to escape. Push the new handles onto the valve stems and tighten the set screws. Finally, apply plumber's putty to the base of the new tub spout or use Teflon tape on its threads, and screw it into place until it is snug and flush against the wall.