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.
They are usually located where the water pipe enters the room such as behind the toilet or under the sink.
Deburr the pipe with a deburring tool.
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.
You will need to turn the main water valve off to your home if you replace the cold water valve under your kitchen sink.
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.
Supply stop valves primarily control water flow to household plumbing fixtures.
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If you see water leaking out this means the valve is leaking.
With a few household tool.
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Start with the kitchen sink shutoff valve.
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.
This is the sink drain pipe.
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At home they re typically used under kitchen sinks that have a hot and cold water supply system.
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.
It is very common for this to happen.
Turn off the next valve up the line which may be the main water supply valve.
This allows easy water shut off to the fixture for maintenance and repair without having to turn water off to the entire home.
Its purpose is to shut off the fluid flow in one pipe while opening fluid flow in another pipe.
Open the cabinet below the sink and remove anything stored there.
Check the valve very carefully for about 30 minutes with a flashlight and if you find it is leaking then remove and replace it.