The plumbing supply shutoff valves behind toilets or under sinks can go for years without being turned off and then reopened again. 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. Fixing the valve is usually pretty simple if you know what to do.
Tighten the Packing Nut
- Tighten the packing nut on the toilet shutoff valve one-eighth turn clockwise to try to seal a leak around the nut.
- Pro tip: Wrap cloth or masking tape on the plier’s jaws to protect the nut’s finish. Use light, steady pressure so you don’t damage the water lines.
Article source here: How to Fix a Leaking Shutoff Valve
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