The first critical action is to completely stop the flow of water to your entire house. Locate your main water shutoff valve, which is typically found in the basement, a crawl space, a utility closet, or outside near the water meter. Turn the valve handle clockwise until it is fully closed. For a lever-style valve, turn it so the handle is perpendicular to the pipe. Once closed, relieve the pressure in the pipes by opening a faucet on the lowest level of your home (like a basement sink or outdoor spigot) and the faucet connected to the valve you are replacing. Let them run until the water stops flowing.
You're viewing a step from: How to Replace a Leaky Angle Stop (Shutoff Valve) Under Your Sink
This guide provides comprehensive, step-by-step instructions for replacing a leaky angle stop (the shutoff valve under a sink) connected to a copper pipe. The process involves shutting off the main water supply, removing the old valve and its compression fittings, preparing the pipe, and installing a new quarter-turn compression-style angle stop.
Frequently Asked Questions
What should I do if the old compression nut and ferrule are seized onto the copper pipe?
Apply penetrating oil, like Blaster PB Penetrating Oil, directly to the nut and ferrule. Allow it to soak for 15-30 minutes before attempting to loosen it again with your adjustable wrench. If it's still stuck, you may need to carefully cut the old ferrule off with a small hacksaw or specialized tool, taking care not to damage the copper pipe itself.
How can I prevent leaks after installing the new angle stop?
Ensure the copper pipe is clean, smooth, and free of burrs or scratches where the new ferrule will sit. Hand-tighten the compression nut first, then use your adjustable wrench to tighten it an additional half to three-quarters of a turn. Avoid overtightening, as this can damage the ferrule or pipe, but ensure it's snug enough to prevent drips.
Do I really need to shut off the main water supply for this project?
Yes, absolutely. Shutting off the main water supply is crucial to prevent significant flooding when you remove the old valve. Always relieve any remaining water pressure by opening a nearby faucet after shutting off the main supply, before starting work under the sink.
How long should this project typically take for a beginner?
For a DIY beginner, expect this project to take approximately 1 to 2 hours. This accounts for time to gather tools, carefully follow each step, and troubleshoot minor issues like a stubborn old valve or initial small leaks. Taking your time will help ensure a successful installation.
How to Replace a Leaky Angle Stop (Shutoff Valve) Under Your Sink
View Full ProjectRelated Videos
Step 1: Shut Off Main Water and Relieve Pressure
Step 1: Shut Off Main Water and Relieve Pressure
Step 1: Shut Off Main Water and Relieve Pressure
Step 2: Prepare the Work Area
Step 2: Prepare the Work Area
Step 2: Prepare the Work Area
Step 3: Disconnect Faucet Supply Line
Step 3: Disconnect Faucet Supply Line
Step 3: Disconnect Faucet Supply Line
Step 4: Remove the Old Angle Stop
Step 4: Remove the Old Angle Stop
Step 4: Remove the Old Angle Stop
Step 5: Remove Old Compression Nut and Ferrule
Step 5: Remove Old Compression Nut and Ferrule
Step 5: Remove Old Compression Nut and Ferrule
Step 6: Clean and Prepare the Copper Pipe
Step 6: Clean and Prepare the Copper Pipe
Step 6: Clean and Prepare the Copper Pipe
Step 7: Install the New Angle Stop
Step 7: Install the New Angle Stop
Step 7: Install the New Angle Stop
Step 8: Tighten Connections
Step 8: Tighten Connections
Step 8: Tighten Connections
Step 9: Restore Water and Check for Leaks
Step 9: Restore Water and Check for Leaks
Step 9: Restore Water and Check for Leaks
Step 10: Final Cleanup
Step 10: Final Cleanup
Step 10: Final Cleanup
Start your project
chat with your ai