To fix a leaky single-handle bathtub faucet, you need to replace the internal mixing cartridge. First, shut off the main water supply to your house. Remove the handle set-screw, pull off the handle, and remove the metal retaining clip holding the cartridge in place. Pull the old cartridge straight out using a cartridge puller tool, clean any mineral scale from the inner valve body, insert a new replacement cartridge, secure the clip, and reassemble the handle. Callout type="warning" title="Hygiene Warning": Shut off the main water supply before disassembling shower mixing valves. Verification: Turn the water back on and test the handle to confirm zero leaks.
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