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1214 M-Core Cartridge 4 Series

This article will give step-by-step instructions on how to replace a 1214 cartridge in a two 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: Phillips Screwdriver, Pick, Flathead Screwdriver, Adjustable Wrench or Pliers, Needle-Nose Pliers, 3/32" Hex Wrench, Safety Glasses
  • We recommend covering the drain before beginning so as not to lose any parts down the drain.

To View Complete Installation Video Visit: M-CORE 1214 Cartridge Replacement.

Handle Removal:

1. Using a 3/32" Hex wrench, loosen the two Set screws on the underside of the handle until you can remove the Flow/Temperature handle. 

  • Remember to cover your drain.
  • The two Set Screws are less than 1/2" long:
  • If you loosen them too far they will fall out, only loosen them enough so the handle will come off

2. Slide the Sleeve off of the Escutcheon Plate and Valve Assembly.

Cartridge Parts Legend:

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4 Valve Body


3 Adapter with Check Valves


2 Cartridge


1 Cartridge Nut

3 Adapter with Check Valves: The Check Valves are pressed into the sides of the Adapter at the distribution center however occasionally during transit they can become loose. This is a simple fix, they can be pressed firmly into the appropriate hole on the Adapter.
Cartridge Removal and Valve Body Preparation:



 Using an adjustable wrench, unthread the Cartridge Nut (1) counter-clockwise to remove.



Slide the cartridge out of the brass Valve Body (4).


Using Needle-Nose pliers, remove the Adapter with Check Valves (3)

Note: If you notice residue inside the Valve Body (4) see article, Valve Body Cleaning and Flushing.


Using the lubricant supplied with your 1214 Cartridge (packet number 99915), grease the Outer O-Ring and inside of the Valve Body (4).


Installing the Cartridge:

Four Port Valve


Three Port Valve


The next piece you are installing is the Adapter with Check Valves (3). First, confirm both Check Valves are securely in place on either side of the Adapter (3). Locate the hole in the back wall of the Valve Body (4). Line up the Adapter tab with the hole in the Valve Body (4) and slide the Adapter (3) in as far as it will go.

Note based on your installation the opening for the Adapter tab may be at the top or bottom of your valve body



Align the 2 posts on the Cartridge (2) to the opening at the top of the Adapter with Check Valves (3) and push the Cartridge (2) into Valve Body (4) until it stops. Tighten the Cartridge Nut (1) onto the Valve Body (4) by turning clockwise until hand tight, and then an additional 1/4 turn with a wrench.

Handle Reassembly:


Slide the Sleeve onto the assembly until it is flush with the Escutcheon Plate and Valve Assembly.



With both levers pointing down, place the Flow/Temperature handle onto the stem of the Cartridge (2). Push the handle as far back as it can go and use a 3/32" Hex wrench to tighten the two Set screws on the underside of the handle.

For additional information on M-Core Shower products, visit Two Handle Shower: M-Core 4 Series Valve at

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