Step 1 · Shut Off Main Water Supply and Drain Lines
First, you must completely stop the flow of water to your home's plumbing system. Locate the main water shutoff valve, which is typically found in a basement, crawl space, or garage near where the water service line enters the house. It will have a wheel handle or a lever handle. Turn the handle clockwise until it is fully closed. To drain the remaining water from the pipes, open a faucet on the highest floor of your house (e.g., a second-floor bathroom) and another one at the lowest point (e.g., a basement utility sink). This allows air into the system and lets the water drain out, minimizing spillage when you remove the old valve. Place a bucket and towels under the sink where you will be working.
Tools and Materials
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