Remove the Old Valve — Remove the Old Angle Stop
Part of project
How to Replace a Leaky Angle Stop (Shutoff Valve) Under Your Sink · Step 3 of 8
In this video
First, attempt to loosen the old pressure-reducing valve using two pipe wrenches for leverage. If the valve is seized or installed in a way that prevents it from rotating, a special technique is required. Use a rotary tool with a metal cutting disc to carefully cut a small relief slot into the brass body of the valve where it connects to the threaded pipe adapter. Be extremely cautious not to damage the pipe threads underneath. This slot relieves the tension, allowing you to use a pipe wrench to break the valve loose. Once free, unscrew the valve body and remove the lower union connection to completely detach the old valve.
Goal: Plumbing Fixture Removal
- Do not cut into the threads of the male pipe adapter, as this will damage it and require replacement of that pipe section.
- Always wear appropriate personal protective equipment (PPE), including safety glasses and gloves, when cutting metal.
Used in this video
- Pipe Wrench (Pipe Wrench Size: 10-inch) — Gripping and turning the valve and fittings to loosen and remove them.
- Rotary Tool (brand: Dremel (implied)) — Cutting a relief slot into the brass valve body to free it from the pipe threads.
- Metal Cutting Disc — Attaching to the rotary tool for cutting the brass valve.
- Safety Glasses (Safety Equipment: Safety Glasses) — Protecting eyes from flying metal fragments during cutting.
- Gloves (Safety Equipment: Gloves, Gloves Material: Nitrile) — Protecting hands during the repair process.
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FAQs
What's the most critical safety step before beginning the angle stop replacement?
The most critical step is always to shut off the main water supply to your house completely, not just the valve under the sink. This prevents potential flooding and ensures no water pressure is present while you're working on the pipe.
How long should a beginner expect this project to take, and what is the approximate cost?
For a beginner, this project typically takes 1 to 2 hours, allowing time for preparation and careful leak checks. The material cost is relatively low, mainly for the new angle stop and a new supply line, usually ranging from $20 to $40.
What tools do I need beyond basic wrenches for this project?
While adjustable wrenches and pliers are essential, 150-grit sandpaper is crucial for cleaning the copper pipe to ensure a good seal. You'll also need a bucket for draining water and plenty of absorbent towels (like WYPALL L40 or Scott Rags) to manage spills.
What's a common mistake beginners make that can lead to leaks after installation?
A common mistake is not thoroughly cleaning and preparing the copper pipe surface before installing the new compression fitting. Ensure the pipe is smooth, free of burrs, and clear of old compression ring residue using 150-grit sandpaper for a watertight seal.
Remove the Old Valve — Remove the Old Angle Stop
Part of project
How to Replace a Leaky Angle Stop (Shutoff Valve) Under Your Sink · Step 3 of 8
In this video
First, attempt to loosen the old pressure-reducing valve using two pipe wrenches for leverage. If the valve is seized or installed in a way that prevents it from rotating, a special technique is required. Use a rotary tool with a metal cutting disc to carefully cut a small relief slot into the brass body of the valve where it connects to the threaded pipe adapter. Be extremely cautious not to damage the pipe threads underneath. This slot relieves the tension, allowing you to use a pipe wrench to break the valve loose. Once free, unscrew the valve body and remove the lower union connection to completely detach the old valve.
Goal: Plumbing Fixture Removal
- Do not cut into the threads of the male pipe adapter, as this will damage it and require replacement of that pipe section.
- Always wear appropriate personal protective equipment (PPE), including safety glasses and gloves, when cutting metal.
Used in this video
- Pipe Wrench (Pipe Wrench Size: 10-inch) — Gripping and turning the valve and fittings to loosen and remove them.
- Rotary Tool (brand: Dremel (implied)) — Cutting a relief slot into the brass valve body to free it from the pipe threads.
- Metal Cutting Disc — Attaching to the rotary tool for cutting the brass valve.
- Safety Glasses (Safety Equipment: Safety Glasses) — Protecting eyes from flying metal fragments during cutting.
- Gloves (Safety Equipment: Gloves, Gloves Material: Nitrile) — Protecting hands during the repair process.
Frequently Asked Questions
What's the most critical safety step before beginning the angle stop replacement?
The most critical step is always to shut off the main water supply to your house completely, not just the valve under the sink. This prevents potential flooding and ensures no water pressure is present while you're working on the pipe.
How long should a beginner expect this project to take, and what is the approximate cost?
For a beginner, this project typically takes 1 to 2 hours, allowing time for preparation and careful leak checks. The material cost is relatively low, mainly for the new angle stop and a new supply line, usually ranging from $20 to $40.
What tools do I need beyond basic wrenches for this project?
While adjustable wrenches and pliers are essential, 150-grit sandpaper is crucial for cleaning the copper pipe to ensure a good seal. You'll also need a bucket for draining water and plenty of absorbent towels (like WYPALL L40 or Scott Rags) to manage spills.
What's a common mistake beginners make that can lead to leaks after installation?
A common mistake is not thoroughly cleaning and preparing the copper pipe surface before installing the new compression fitting. Ensure the pipe is smooth, free of burrs, and clear of old compression ring residue using 150-grit sandpaper for a watertight seal.