How to Replace a Leaky Angle Stop (Shutoff Valve) Under Your Sink

How to Replace a Leaky Angle Stop (Shutoff Valve) Under Your Sink

Advanced
30 min
6 Steps
19 items

This project involves replacing a leaking shutoff valve (angle stop) under a sink. The process includes shutting off the main water supply, removing the old valve from the copper pipe stub-out, cleaning the pipe, installing a new compression-style angle stop, and reconnecting the faucet supply line, followed by a thorough leak test.

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Best for advanced DIYers and professionals with basic plumbing knowledge.

Tools & Materials

Unger 6 Gal. Heavy-Duty Plastic Bucket DB02

Unger 6 Gal. Heavy-Duty Plastic Bucket DB02

The Unger 6-Gallon Heavy-Duty Professional Cleaning Bucket holds more than 6 Gal. of liquid. The bucket can accommodate a scrubber up to 14 in. L. This bucket features measurement marks and 2-pour spouts

FRESHFOLDS Combed Cotton Absorbent Textured 6 Piece Hand Towel Set EC100757

FRESHFOLDS Combed Cotton Absorbent Textured 6 Piece Hand Towel Set EC100757

Versatile, stylish, and functional are only a few ways to describe these bath towels. These towels are made with long cotton fibers that are looped to create a soft feel while still offering optimal absorbency

Hybrid Light Solar Flashlight - Black 001175

Hybrid Light Solar Flashlight - Black 001175

The Hybrid Solar Light uses revolutionary technology that generates power from any light source, indoor lighting or sun light and stores it for later use. The Hybrid Solar Light is always collecting power

Common Problems

Difficulty reaching and loosening corroded nuts in tight spaces.

Solution: A basin wrench is specifically designed for reaching these tight spaces. An extendable model can make this easier.

Water spills onto the floor when disconnecting the old valve.

Solution: Place a towel under the sink to catch any residual water.

Difficulty reaching and loosening the shutoff valve nut under the sink.

Solution: A basin wrench is specifically designed for reaching these difficult nuts and is highly recommended for this step.

Ensure both the hot and cold water lines are fully shut off before proceeding to the next step.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

Confirm that the water is completely off by checking a faucet inside the house before proceeding to cut any pipes.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

Failing to shut off the water will result in uncontrolled water flow when you disassemble the faucet.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

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

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

Frequently Asked Questions

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.

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.

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.

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.

Yes, while compression-style is common, 'push-connect' angle stops are a beginner-friendly alternative. They often don't require wrenches for attachment to the pipe stub-out, simplifying installation and reducing the risk of improper tightening.

First, reconfirm that the compression nut (if applicable) is adequately tightened – snug, but not excessively so. Then, check the pipe end for any burrs or rough spots that might prevent a good seal, and ensure the ferrule is seated correctly.

The material costs are relatively low. The new angle stop typically costs between $10-$20, plus a few dollars for sandpaper or thread sealant. Your total material expenditure, excluding tools, should generally be under $30-$40.

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30 min | 6 Steps