Turn the home water supply back on.
Replace kitchen water shut off valve.
The shut off valves are easy to spot.
To replace a shut off valve in the kitchen sink you need to locate the valves that turn the water supply on or off.
Open the cold water handle of the kitchen faucet and let the water drain out if you re replacing the cold valve.
Turn off the main water supply for the house.
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Attach the water line from the faucet to the water supply shut off valve using plumbers tape.
Shut off the circuit breakers to an electric water heater.
If you have a gas water heater turn the knob to the pilot position.
Place valve in accessible location.
Shut off water supply.
Typically there are two shut off valves installed underneath the kitchen sink.
Turn off the next valve up the line which may be the main water supply valve.
The main water shut off valve stops the flow to the entire home from the water meter while other water valve types shut off the water at individual appliances fixtures and faucets.
Shut off the water at the main shutoff valve.
One for the hot water supply and the other for the cold.
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.
Then open a faucet on the lowest level of your house and another faucet on an upper level to drain the pipes.
Once tight and in place turn the valve on and test the kitchen faucet.
When cutting the supply line cut slowly and gently so.
Place a bucket under the old valve.
There should be no leaks and all should be good.
Turn the water supply valve under the sink off.
Deburr the pipe with a deburring tool.
Demolition and wall floor ceiling surface restoration is extra if needed.
Cut fit and securely attach shut off valve to existing water supply line.
Open the faucet to drain the line.
Put a bucket under the drain pipe.
Good job you have fixed your leak.
Prepare for valve replacement.