Here are step-by-step instructions for replacing your T-550 stem and cartridge:

Step 1:

Determine which T-550 model you have to ensure you order the correct replacement parts.

There are TWO ways to do this (A or B).

 Look at the identification disc located on the handle as shown.  If a size appears on your handle, note the handle color (Brown or Black) and determine your part number using the chart below.

You can order your replacement part from a selection of the online retailers that follow:

Once your replacement part arrives, proceed to Step 2.

 If a size does NOT appear on your handle, you will have to remove the stem assembly and measure it to ensure you get the proper replacement stem.  Follow Steps 2 - 4 below...

Step 2:

Turn off the water supply.  If you do not know how, please contact a licensed plumber.

Step 3:

Remove the stem assembly from the body of the T-550:

Black Handle

Step 4:

(skip this step if you already have your replacement stem assembly)

Measure the FULL LENGTH of the assembly as shown and note the number of o-rings on the cartridge at the end of the stem, opposite the handle.

Visually identify the cartridge you have and use the corresponding chart to determine the replacement part number.

(1) O-ring, (2) Tabs

(2) O-rings, No Tabs

You can now order your part from a selection of online retailers below:

Step 5:

Remove the handle from the old stem and place it onto the replacement stem.

Step 6:

Insert the stem assembly into the body

Step 7:

Turn on the water to check for leaks.