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My shower is controlled by what I think is a Trevi Hathaway Exposed Thermostatic Shower Valve L6800AA. The shower works fine but when I turn it to the off position it doesn’t shut off completely right away. I have to keep giving the handle an extra tweak until the flow eventually stops. Can you tell me what the problem is likely to be and if it can be fixed with new seals or a complete new cartridge.
