Remove the depth guide. Install the shower valve's trim package and handle, following the manufacturer's instructions. Some installers place a small bead of caulking along the escutcheon's outside edge before sliding it against the tile. This helps prevent moisture from entering the wall cavity.
Replace the single-handle shower valve's depth guide. Repair or install the shower's wall board and tile. Cut the tile tight to the depth guide. This ensures the valve's trim package covers the opening in the wall tile. Grout and clean the shower walls.
Take off the shower head and attach the half-inch coupling to the goose-neck. Hand tighten it. Attach your bike pump or air source to the other end of the tubing. Turn the shower valve to the hot position and pump the pump a couple of times. Repeat this step with the valve in the cold position. Three or four pumps in each position should be good.
To replace a involves two main parts: removing the old valve and installing the new valve. There are various reasons to replace a shower valve. In this case the old shower valve was not pressure balanced so anytime someone used water throughout the house the shower pressure would fluctuate. These fluctuations are sometime just uncomfortable but sometimes the temperature change can actually cause burns.
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