To stop a bathtub faucet from dripping when the handle is closed, you must replace the worn-out internal cartridge or seals. First, shut off the main water supply to your house. Remove the handle set-screw, pull off the handle, and take out the internal valve cartridge. Install an exact-matching replacement cartridge, secure all mounting components, and turn the main water back on. Callout type="warning" title="Hygiene Warning": Shut off the main water supply before beginning plumbing repairs. Verification: Test the faucet valve in the closed position to confirm zero dripping.
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