How to Replace the Cartridge on a Mixet Shower Faucet

Bathtub filled with water
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  • 01 of 07

    Replace A Mixet Shower Cartridge

    Mixet shower valve
    Aaron Stickley

    The Mixet company is no longer in business, but thousands of their shower valves are still in operation. When repairs are needed, it is a fairly easy and inexpensive matter to replace the internal cartridge with one offered by an aftermarket manufacturer, designed to match the original part. Simply look for a replacement cartridge specified to fit the Mixet faucet model you own. 

    Signs that a Mixet cartridge is wearing out include:

    • Stiff diverter: It becomes difficult to divert the temperature from hot to cold on the temperature control.
    • Dripping: The valve is dripping or takes a lot of tightening to close the valve fully and stop dripping.
    • Temperature imbalance: The hot and cold water are not balancing as good as it used to.
    • Frequent repairs: Replacing the plastic handle is occurring more often then you like.

    Mixet shower valves work quite well, so by replacing the cartridge and handle kit, you can usually enjoy many more years of service.

    Tools and Materials You Will Need

    • Replacement cartridge for Mixet faucet
    • Screwdrivers
    • Channel-type pliers
    • Utility knife (if needed)
    • Plumber's stem grease
    • Tub and tile caulk
    Continue to 2 of 7 below.
  • 02 of 07

    Turn Off the Water and Drain the Pipes

    Mixet Cartridge
    Aaron Stickley

    Buy a Mixet shower cartridge to match your shower valve—they are available at most home improvement and hardware stores.

    Start by shutting off the water to the house. Drain any water remaining in the pipes by turning on the faucet for the bathroom sink.

     

    Continue to 3 of 7 below.
  • 03 of 07

    Remove The Mixet Handle And Temperature Knob

    Mixet Handle
    Aaron Stickley
    1. Remove the screw in the center of the handle and then pull the handle straight out and off.
    2. Now, remove the temperature knob by partially unscrewing the screw in the top of the knob. You may need to shake it back and forth and side to side to loosen it for removal. 
    3. Loosen the set screw holding the escutcheon plate, then pull the plate off.  You may have to cut the caulking off of the plate to remove it.
    Continue to 4 of 7 below.
  • 04 of 07

    Remove the Mixet Cartridge

    Removing a Mixet cartridge
    Aaron Stickley
    1. With the handle removed, use pliers to remove the mounting nut on the Mixet cartridge. Turn the nut counterclockwise until it comes all the way off. The cartridge will remain inside of the valve body after the nut has been removed.
    2. Using pliers, grip the flat ridges of the cartridge, then turn it side to side while pulling straight out. The cartridge should pull free from the faucet body. Note: In a few models there is a retaining clip that also holds the cartridge in place. Remove this clip in order to pull the cartridge out. 
    Continue to 5 of 7 below.
  • 05 of 07

    Install the New Cartridge

    Installing a new Mixet cartridge
    Aaron Stickley
    1. Apply a thin layer of stem grease to the O-rings on the new cartridge. 
    2. Align the cartridge for the proper insertion. There is usually a red mark on the cartridge indicating which side is up. If your temperature knob was in the down position, put the cartridge in with the red mark facing up. However, if your temperature knob was in the up position, the red mark down should face down.
    3. Push the cartridge all the way in. If necessary, wiggle the cartridge with pliers as you push it in.
    4. Make sure the two brass rings are correctly positioned inside the mounting nut, then reattach the nut to the faucet body.
    5. Tighten the mounting nut firmly, but periodically check to make sure the cartridge can still be rotated side-to-side. If the cartridge is too stiff you can loosen the nut a bit.
    Continue to 6 of 7 below.
  • 06 of 07

    Install the Temperature Knob and Handle

    Installing a Mixet valve handle
    Aaron Stickley
    1. Put the escutcheon plate back on the wall (or install a new one if you have it).
    2. Install the temperature knob, making sure the little nipple is in the groove of the cartridge before you tighten the screw.
    3. Put the handle back in place and screw it on.
    4. Test the faucet to make sure it works properly.
    5. Caulk around the rim of the escutcheon plate to seal it. 
    Continue to 7 of 7 below.
  • 07 of 07

    Reversing Temperature

    Reverse Mixet temperature control
    Aaron Stickley

    A common mistake is to install the cartridge so that the temperature controls are reversed—so that the hot is to the right and the cold is to the left. 

    This is easily fixed. Remove the handle and temperature knobs again, and open the water flow with the handle. While water is flowing through the spout, spin the cartridge in place 180 degrees. This will solve the problem.