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On the bottom of the "stem" is a rubber gasket called a washer. This washer is solely responsible for the stoppage of flow. Some "stems" do not use washers but are valves within themselves. You will have to replace the "stem". To fix this: 1) Turn water off under sink by turning the T-Stop valves (for a sink) or the Water Main in the house (for a tub/shower). 2) Remove faucet handle ( 1 screw usually under a metal or plastic cap on the top of the handle). Be careful for the screws are often rusted or degraded and can cause alot of problems. 3) Remove the stem using the proper sized wrench. Often times the stem is reverse threaded meaning "righty loosey" rather than "lefty loosey" (careful! here too you can run into degradation). 4) On the bottom of the stem you will see the washer (held in with 1 screw {degredation warning}) Remove the washer (if you see no washer it is time to buy stems) and match it in size at your local Hardware store or with the proper one in the Assortment Pack you previously purchased (Hint! Hint!). If the screw on the bottom of the stem is completely (most likely) degraded (un-removable) you will have to replace the stem ($6.00 - $21.00). Your local Hardware store or Plumbing supply house will serve you if you bring the old one with you. (there are many,many,many different types) 5) Reverse the process for assembly and your will no longer be leaky. Y-THINK-Y

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Q: What would cause the bathtub faucet to leak when both knobs are turned off tightly?
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