How to Replace a Shower Diverter Valve

Remove the old diverter valve by unscrewing it from behind the wall or pulling it from the tub spout, then install the new valve using plumber's tape and proper alignment.

  1. Kill the Water First. Locate your home's main water shutoff valve and turn it off completely. Open the shower faucet and tub spout to drain any remaining water from the pipes. This prevents flooding when you remove the old valve.
  2. Expose the Valve. Take off the shower handle by removing the screw in the center or pulling it straight off if it's a push-on type. Remove the trim plate or escutcheon by unscrewing it or pulling it away from the wall. This exposes the valve assembly behind the wall.
  3. Find Your Diverter Type. Look for the diverter mechanism inside the valve body. On three-handle systems, it's usually a separate valve between the hot and cold handles. On single-handle systems, it's built into the main cartridge. Take a photo before proceeding so you remember the original configuration.
  4. Extract the Old Valve. For separate diverter valves, use a pipe wrench or valve socket tool to unscrew the old valve counterclockwise. For cartridge-style diverters, pull out the entire cartridge using pliers or a cartridge puller tool. The valve may be stuck due to mineral buildup, so apply steady pressure.
  5. Scrub Clean Surfaces. Remove any old plumber's tape, mineral deposits, or debris from the valve seat using a wire brush and white vinegar. The surface needs to be clean and smooth for the new valve to seal properly. Wipe everything dry with a clean rag.
  6. Seat the New Valve. Wrap the threads of the new valve with 2-3 layers of plumber's tape, wrapping clockwise. Thread the valve into position by hand first, then tighten with your wrench until snug. Don't overtighten as this can crack the valve body or strip the threads.
  7. Verify Flow and Switches. Turn the water supply back on slowly and check for leaks around the new valve. Operate the diverter several times to ensure it switches water flow properly between the tub spout and showerhead. Make any necessary adjustments before proceeding.
  8. Reassemble Everything. Replace the trim plate and shower handle in reverse order of removal. Make sure everything aligns properly and the handle operates smoothly. Test the complete system one final time to confirm proper water flow and diverter operation.