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Moen Solutions

1225 Cartridge: Single Handle Shower-Standard Valve

This article will give step-by-step instructions on how to replace a 1225 flow cartridge in a single handle Standard valve shower.


  • The water supply shut off valves must be turned off- see article How to Turn Off the Water Supply to the Faucet.
  • Recommended Tools: Phillips Screwdriver & Adjustable Wrench
  • The following instructions assume the handle and associated handle pieces have been removed. For additional details, visit and select the type you are repairing. The faucet guide will contain specific information on handle assemblies associated with that style of product.
  • We recommend covering the drain before beginning so to not loose any parts down the drain.


Valve and Escutcheon



standard shower valve breakdown.png


1. Grab ahold of the stop tube (#3) and pull it forward until it has been removed.


2.  Slide the "D" washer (#4) off the stem of the cartridge (#6). 

3. Lift the tab at the top of the U-shaped copper colored retaining clip (#5) just enough to grab it with your hand to fully remove. Be careful not to drop the clip behind the wall. *If you do not have access to the copper clip, you will need to remove the escutcheon. Use a Phillips screwdriver to remove the escutcheon screws (#1) and then pull escutcheon plate (#2) off.


3. Using the plastic twisting tool (see image A below) provided in the 1225 cartridge kit (#6), rotate the cartridge (#6) 1/4 of a turn (90 degrees) in either direction. This will help loosen the cartridge (#6). Remove the twisting tool (A) from the top of the cartridge (#5). Pullout the stem of the cartridge (#6) until it stops. Using pliers, grab the stem of the cartridge (#6) and pull the cartridge (#6) out. This may require some effort. Note: It is highly recommended to clean and flush the valve body (#7) before installing the new cartridge (#6). See Valve Body Cleaning and Flushing for additional details.



1. Slide the new cartridge (#6) into the brass valve body (#7). Use the twisting tool to position the cartridge (#6) correctly in the valve body (#7). The plastic tabs on the cartridge (#6) must be centered on the slots on the valve body (#7), which are located at the 12 and 6 o'clock positions.   



2. Gently slide the copper clip (#5) back into the brass valve body (#7) on top of the cartridge (#6). If you encounter any resistance, do not force the copper clip (#5). The cartridge (#6) may not be properly aligned (see step 1). If for any reason the copper clip (#5) cannot be installed, the water cannot be turned back on to the faucet until the copper clip (#5)  is replaced.


3. Rotate the stem of the cartridge (#6) so the small notch is facing down. The notch on the stem of the cartridge (#6) determines the hot and cold location. On most faucets when you move the faucet handle to the left, you will get hot water. If you move the faucet handle to the right, you will get cold water. This is a function of the cartridge stem. If the hot and cold are reversed, rotate the stem of the cartridge (#6) 180 degrees.


4. Slide the "D" washer (#4) on the stem of the cartridge (#6). Slide the stop tube (#3) back onto the valve body (#7).

For additional information on Moen products visit and select the type of product you are repairing. The guide will contain repair details, troubleshooting and specific information on assembling handles associated with that style of product.

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