Plumbing Questions? Ask a Plumber for Answers ASAP
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The issue is either the gaskets in the mixing cartridge or the mixing cartridge itself. It depends on who makes the shower. You will have to get parts for the specific manufacturer. It may say on the face plate and may hardware stores should supply parts for it. Hopefully it has isolation valves on it too. Often the valves will be behind the face plate. They will be two little flat head screws that turn counter clockwise all the way until off then the cartridge can be removed.