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1213 M-Core Cartridge 3 Series: 4 Port Valve

This article will give step-by-step instructions on how to replace a 1213 cartridge in a single handle M-Core 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: Adjustable Wrench or Pliers, Needle-Nose Pliers, 3/32" Hex Wrench
  • We recommend covering the drain before beginning so not to lose any parts down the drain.

To View Complete Installation Video Visit: Installation Help at, Video Titled M-CORE 1213 Cartridge Replacement.

Handle Removal:

Handle removal.png

Using a 3/32" Hex Wrench, loosen the Handle Screw until you can remove the Handle.



Slide the Sleeve off of the assembly.

Parts Legend


6 Valve Body


5 Adapter with Check Valves


4 Pressure Balancing Puck


3 Cartridge


2 Cartridge Nut


1 Installation Sleeve (Included with the 1213 Cartridge Kit)

Cartridge Removal and Valve Body Preparation

removing nut and 1213 .gif

Unthread and remove the Cartridge Nut (2). Pull the blue Cartridge (3) out


Using Needle-Nose pliers, remove the Pressure Balancing Puck (4), O-ring and Adapter (5).


Grease the Outer O-Ring and inside of Valve Body (6).

Note: If you notice residue inside the Valve Body (6), see article, Valve Body Cleaning and Flushing.

4 Port: Tub and Shower Valve (For 3 Port: Shower Only Valve, Click Here)
Snag_11883c4.png If you need to reinstall the Pressure Balancing Puck (4) and Adapter (5) into the Installation Sleeve (1), the tab on the Adapter (5) needs to be down, opposite the tab on the top of the Installation Sleeve (1).

4 Port.gif

Install the assembly into the Valve Body (6) aligning the adapter tab with the hole in the Valve Body (6).



1213 installation.gif

align cartridge to valve.png

Align the 2 posts on Cartridge to mating feature on Pressure Balancing Puck (4) and push Cartridge (3) into Valve Body (6) until it stops. Tighten Cartridge Nut (2) onto Valve Body (6) by turning it clockwise until hand tight, and then turn an additional ¼ turn with a wrench.

For additional information on M-Core Shower products, visit Single Handle Shower: M-Core at

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