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How to replace a shower cartridge

We'll replace the shower cartridge to fix leaks, low flow, or temperature issues.

How-to · Home plumbing
30–60 min
What you'll need
  • Replacement cartridge (match the brand and model—bring the old one to the store)
  • Cartridge puller (if the cartridge is stuck)
  • Screwdriver set, pliers
  • Silicone grease (optional, for O-rings)

At a glance

  • Shut off the water supply to the shower—usually at the main or a dedicated valve—before removing the cartridge.
  • Remove the handle, trim plate, and retaining clip or nut to access the cartridge.
  • Pull the old cartridge out with a cartridge puller or by rocking it gently; note the orientation for the new one.
  • Install the new cartridge in the same orientation; replace the O-rings if the kit includes them.
  • Turn the water back on slowly and test for leaks and proper temperature control.
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Get started

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Steps

Goal: Replace the shower cartridge to fix leaks or temperature issues.

  • Shut off the water supply to the shower. Open the valve to release pressure.
  • Good: Water is off. Proceed to Remove the handle and trim.
  • Bad: Water will not shut off—locate the main or call a plumber.

Remove the handle and trim

Goal: Expose the cartridge.

  • Remove the handle screw (under the cap) and the handle. Remove the trim plate screws and the plate.
  • Good: Valve body and cartridge are visible. Proceed to Remove the retaining clip.
  • Bad: Handle or screws are stuck—use penetrating oil or a plumber.

Remove the retaining clip

Goal: Free the cartridge for removal.

  • Remove the U-shaped clip, retaining nut, or screw. Set it aside.
  • Good: Cartridge is loose. Proceed to Pull the old cartridge.
  • Bad: Clip or nut is corroded—use penetrating oil.

Pull the old cartridge

Goal: Extract the cartridge without damaging the valve body.

  • Use a cartridge puller or pliers. Rock gently—do not force. Note the orientation.
  • Good: Cartridge is out. Proceed to Install the new cartridge.
  • Bad: Cartridge will not budge—try a cartridge puller or call a plumber.

Install the new cartridge

Goal: Seat the new cartridge correctly.

  • Clean the valve body. Insert the new cartridge in the same orientation. Reinstall the retaining clip.
  • Replace the trim plate and handle. Turn the water back on slowly.
  • Good: No leaks; handle operates smoothly. Proceed to Verification.
  • Bad: Leaks at trim—check the cartridge orientation and O-rings.

When to get help

Call a plumber if:

  • The water supply will not shut off.
  • The cartridge will not come out and you risk damaging the valve body.
  • You have a pressure-balanced or thermostatic valve and are unsure of the correct cartridge.

Verification

  • No drips at the handle or trim plate.
  • Hot and cold respond correctly when you turn the handle.
  • Full flow with no sputtering or air in the line.

Reviewed by Blackbox Atlas

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