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Shower valve · Repair Copilot

Shower faucet cartridge replacement

A shower that drips, won't fully shut off, or won't hold a temperature usually has a worn cartridge inside the handle — the part that mixes hot and cold. Swapping it is the standard fix and needs no wall-opening. Shut off the water, point your camera at the handle, and a 30-year plumber persona walks you through pulling the old cartridge and matching a shower faucet cartridge replacement.

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Steps to fix shower faucet cartridge replacement

  1. Shut off the water — at the shower's own stops if it has them, otherwise at the main — and open the valve to drain the line.
  2. Plug or cover the drain so no small parts or screws fall in.
  3. Pop off the handle cap, remove the handle screw, and pull the handle and trim to expose the cartridge; note the brand stamped on it (Moen, Delta, Kohler, Price Pfister all differ).
  4. Remove the retaining clip or nut, then pull the cartridge straight out — a puller tool helps if it's stuck from mineral buildup; note its orientation so the new one goes in the same way.
  5. Take the old cartridge to the store to match an exact replacement — the wrong one won't seat or will reverse hot and cold.
  6. Seat the new cartridge in the same orientation, reinstall the clip and trim, turn the water back on slowly, and test for drips and correct hot/cold sides.

Safety first: if a step calls for gas, a main water or sewer line, a service panel or main breaker, or a sealed refrigerant system, stop and call a licensed pro — Repair Copilot will tell you when you're there.