Shut off the circuit breakers to an electric water heater.
Replace water shut off valve under bathroom sink.
Deburr the pipe with a deburring tool.
The water to a kitchen or bathroom sink is supplied through small copper or flexible neoprene tubes from a small control valve called a stop or shut off valve under the sink.
When cutting the supply line cut slowly and gently so.
Place a bucket under the old valve.
Open the faucet to drain the line.
There are two basic types straight stops and angle stops and these valves normally remain on and are seldom closed functioning maintenance free for years.
Turn off the next valve up the line which may be the main water supply valve.
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.
Then open a faucet on the lowest level of your house and another faucet on an upper level to drain the pipes.
Shut off the water at the main shutoff valve.
These inexpensive little valves rarely get used and when they do sometimes they leak.
If you have a gas water heater turn the knob to the pilot position.