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Shut Off the Main Water Supply — Shut Off Main Water Supply and Drain Lines

Beginner

Part of project

How to Replace a Leaky Angle Stop (Shutoff Valve) Under Your Sink · Step 1 of 6

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In this video

Locate the main water shut-off valve for the house, which is typically found in the basement or a utility closet where the water line enters the home. Turn the valve handle clockwise until it is fully closed to stop the flow of water into the house's plumbing system.

Goal: Stop water flow to the house

  • Make sure you know where your main water shutoff is before you start any plumbing project.

Used in this video

  • Main Water Shut-off Valve (Tool Type: Plumbing Tools, Material: Metal)To stop the flow of water to the entire house.
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FAQs

How long should I expect this project to take for a beginner, and what's the overall difficulty level?

This is a beginner-friendly plumbing project, typically taking 30-60 minutes once you have all the tools and materials ready. The most crucial steps involve ensuring the water supply is off and achieving a watertight seal.

What's the most crucial safety step I need to take before starting to avoid major water damage?

The most crucial step is to fully shut off the main water supply to your home before you begin any work. After turning it off, open a faucet on a lower level to confirm water flow has completely stopped and to drain the lines.

Do I really need a specific type of adjustable wrench, or will any adjustable wrench work for this project?

While the 12-inch adjustable wrench listed provides good leverage, any sturdy adjustable wrench that can securely grip the compression nuts will work. Ensure it's in good condition to prevent slipping and damage.

What is the most common mistake beginners make when installing a new compression angle stop, and how can I avoid it?

The most common mistake is overtightening or undertightening the compression nut, leading to leaks or damaging the valve/pipe. Tighten the nut until it feels snug, then give it an additional quarter to half turn, being careful not to strip threads.

Shut Off the Main Water Supply — How to Replace a Leaky Angle Stop (Shutoff Valve) Under Your Sink (Step 1, Video 2) | Stesso