Step 8 · Repair the Wall with a Remodel Plate
With the plumbing confirmed to be leak-free, it's time to close the wall. The easiest method is to use a faucet remodel plate. These oversized escutcheon plates are specifically designed to cover the hole you created and the original locations of the old hot and cold handles. Apply a thick bead of 100% silicone caulk around the back perimeter of the remodel plate. Slide the plate over the new valve body and press it firmly against the tile wall. The pressure and the caulk will hold it in place and create a waterproof seal. The new faucet trim will further secure it later.