Cut the supply line with a pipe cutter leaving enough room between the escutcheon plate and the cut to allow installation of the valve fitting.
Water shut off valve under kitchen sink.
Turn the taps to the off position.
Its purpose is to shut off the fluid flow in one pipe while opening fluid flow in another pipe.
At home they re typically used under kitchen sinks that have a hot and cold water supply system.
Under sink shutoff valves also called fixture shutoffs or stop valves allow you to turn off the water to the sink or other fixture without having to use the home s main shutoff.
Start with the kitchen sink shutoff valve.
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Check the valve very carefully for about 30 minutes with a flashlight and if you find it is leaking then remove and replace it.
Sinks have shutoff valves attached to their pipes that allow you to turn off the water in one location instead of the entire house when you need to work on the sink plumbing.
You will need to turn the main water valve off to your home if you replace the cold water valve under your kitchen sink.
Turn off the next valve up the line which may be the main water supply valve.
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This allows easy water shut off to the fixture for maintenance and repair without having to turn water off to the entire home.
You should see a large pipe usually made of pvc that has a vertical bend in it before running horizontally to the back wall or rarely down to the floor.
Three way valves are often used for more complex piping systems and are rarely used for under sinks and toilets.
These inexpensive little valves rarely get used and when they do sometimes they leak.
This is the sink drain pipe.
If you see water leaking out this means the valve is leaking.
Deburr the pipe with a deburring tool.
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They are usually located where the water pipe enters the room such as behind the toilet or under the sink.
Replacing a shut off valve compression valve or angle stop may seem like a daunting task but it really takes less than 5 minutes.
Open the faucet to drain the line.
With a few household tool.
Place a bucket under the old valve.