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valve Answered

I have a leaking main valve and am wondering what the knob on the side does and if it can stop it from leaking.

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caitlinsdad

8 years ago

It is a "stop and waste" type right angle water valve. The pipe heading down probably goes to the spigot where you hook up a garden hose. That little cap allows you to drain that segment of pipe to keep it from freezing in the winter. If it is just leaking from that drain cap, you should be able to wrap some plumbers teflon tape around the threads and screw the cap back down. Shut the big valve off first but then you might have problems with the stem seal or the washer leaking inside if it's never been touched in a long time. Good luck.