That inactivity can cause the neoprene washers to become either brittle or crusted up with mineral deposits and they lose their ability to seal leaks.
Sink supply valve.
Open the faucet to drain the line.
Fortunately a bad shut off valve is extremely easy to replace.
Place a bucket under the old valve.
When cutting the supply line cut slowly and gently so.
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At this point if water is still exiting the valve it will need replacement.
Turn on the water supply to the sink once the valve is back in place and the plumbing has been completely re secured.
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These inexpensive little valves rarely get used and when they do sometimes they leak.
The plumbing supply shutoff valves behind toilets or under sinks can go for years without being turned off and then reopened again.
Turn off the next valve up the line which may be the main water supply valve.
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.
The 1 2 inch supply pipes that come to the sink each terminate with a shutoff valve and this valve is one of the two factors that determine the connector size on the faucet hose.
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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.
Deburr the pipe with a deburring tool.
The inlet must match the supply pipe and it can be a 1 2 inch female pipe thread fpt connector for galvanized pipes a 1 2 inch compression or sweat connector for.
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As the line fills watch out for leaks.
If this happens to you you can simply replace the valve with a new valve that matches the old one.
The packing nut of the valve also called the bonnet nut is unscrewed to loosen the shutoff valve knob and make it.
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Sink shutoff valves can freeze or stiffen due to mineral buildup or disuse.
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