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With the valve removed, you will see the old compression nut and a brass ring called a ferrule on the copper pipe. Both must be removed. The nut should slide off. The ferrule can be stubborn. The best method is to use a dedicated ferrule puller tool, which grips behind the ferrule and pulls it off without damaging the pipe. Alternatively, you can carefully cut a slot into the ferrule with a small hacksaw or rotary tool, being extremely careful not to cut into the copper pipe itself. Once cut, you can pry it open with a flathead screwdriver and remove it.

You're viewing a step from: How to Replace a Leaky Angle Stop (Shutoff Valve) Under Your Sink

Beginner

30 minutes

2/4 Inventory

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.

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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.