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Step 1 · Preparation and Water Shut-off

Begin by turning off the water to the entire house. Locate your main water shut-off valve, which is often in a basement, crawl space, or near the water meter, and turn it clockwise until it stops. Open the shower faucet and the lowest faucet in your house (e.g., a basement sink) to completely drain the water from the supply lines. Place a drop cloth in the bottom of the tub or shower to protect the surface from scratches and falling debris.

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