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Step 1 · Preparation and Water Shutdown

Before starting, ensure the work area is safe and you are prepared. Locate the main water shutoff valve for your home (often in the basement, a crawlspace, or near the water meter) and turn it clockwise until it is fully closed. To drain the lines, open the hot and cold handles of the shower faucet you are replacing, as well as a faucet on a lower floor, like a basement sink. Lay a drop cloth in the tub or shower base to protect it from scratches and debris. Put on your safety glasses.

Preparation and Water Shutdown - How to Convert a 3-Handle Shower Faucet to a Single-Handle Valve - Stesso