Quote:
Originally Posted by Tobra
It has "packing" in there that acts as a seal. You take off the handle, unscrew the little cap that shaft the handle was attached to, pull out the old packing, replace it and put it back together. Tight enough it does not leak, not so tight the handle will not turn. Goes bad and makes it leak when turned on. If it leaks all the time, it is probably not the packing. You may be able to just tighten the packing nut. Seen a few different types. A kit that has a couple of rubber or fiber washers or stuff that looks like waxy string. There is also seal inside the valve, but it seems like those don't seem to go bad, make it so it won't turn off completely
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Dr Foot Itch has covered your issue quite thoroughly.
I might add that even on new units if you open the valve hard against the stop it will drip. I open mine wide and then turn it 1/4 turn in.