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What could be some reasons why a tub faucet's spout leaks when water is turned off? E.g. some gasket within the mixing valve perhaps? The shower doesn't leak, just the tub spout.

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    The tub is lower than the shower head so that's where the drip will go to
    – Ed Beal
    Commented Jan 27, 2016 at 1:50
  • Yes, I thought the same
    – amphibient
    Commented Jan 27, 2016 at 2:35

2 Answers 2

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If a new gasket doesn't clear up a drip, the valve seat may need to be resurfaced or replaced. The big box stores have replacement seats and the wrench to do it, and may have the tool to resurface. If the correct replacement seat is available, that's the way to go IMO.

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All such tub spouts have a sealing washer or cartridge with a sealing gasket. You need to unscrew the unit's cap and withdraw the central core.( with main water supply turned OFF ) Now take this to your plumbing store and get a repair kit. They are available fairly cheaply for almost every unit.

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