How Do I Install A Thermostatic Cartridge For A 1/2" Thermostatic Shower Valve?

This article will explain how to install a thermostatic volume control cartridge for a thermostatic shower faucet.

Please note that the images are for reference only. The product shown in this article may differ from yours, but the information below is still relevant.

To install a cartridge, you must:

1. Remove the old cartridge.
2. Install the new cartridge.
3. Test for leaks.

Please Note: Before doing any work on your faucet, please shut off the water supply for the faucet.

Once the water is turned off, you are ready to begin.

Step 1 – Remove the old cartridge

a. After you've removed the handle, use a pair of adjustable pliers to remove the locking nut by turning counter-clockwise.
 

b. Remove the fixed washer by pulling it up with your fingers.

c. Hold the stem of the cartridge and pull out until the cartridge is completely removed from the faucet body.

Step 2 – Install the new cartridge

a. Locate the groove in the plastic cartridge body. With the groove facing up, insert the cartridge into the valve body.

b. Install the fixed washer on the new cartridge. The opening is round on the inside bottom, flat on the inside left and right, and has a small notch on the inside top. It can only fit onto the cartridge one way. Line the small notch up with the matching groove that runs along the top of the cartridge.

c. Using a pair of adjustable pliers, re-install the locking nut. In order to avoid over tightening the locking nut, hand tighten the locking nut, and then use the adjustable pliers to apply a quarter turn. Approximately 10-14 lbs of torque are required to properly install the locking nut.

Step 3 – Test for leaks

a. Once all of the parts are re-installed, turn on the water supply for the faucet and let the water run for approximately 10 minutes. If you notice that water is leaking from the cartridge, tighten the lock nut and test again.