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If it is dripping it is the washer, if it is coming out around the stem that is the packing needing to be replaced or some faucets have fiber cone in them that serves as packing around the stem. If your faucet is a 1/4 turn handle you need to turn the water off either at the sink or the main. If the handle screws in and out one or more complete turns you can do this with the water supply on. Shut the faucet off, remove the handle and any trim ring or cone under it that covers the stem sticking up. There should be a nut around the base of the stem. Unscrew this nut without turning the faucet on. In the nut underneath you will either have stem packing, which is a thick graphite or Teflon string or a fiber cone. replace it with new and reassemble the faucet. If using packing and it still leaks after tightening, you can either tighten it a little more to compress the packing or just add a couple more layers of packing.

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Q: Does a worn out washer cause a water valve to leak?
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