Skip to main content
Moen Solutions

1212 M-Core Cartridge 2 Series: 4 Port Valve

  1. Last updated
  2. Save as PDF
This article will give step-by-step instructions on how to replace a 1212 cartridge in a single handle M-Core valve shower.

Preparation:

  • 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 to not lost any parts down the drain.

To View Complete Installation Video Visit: Installation Help at Moen.com, Video Titled: M-Core 2-Series Cartridge Replacement

Handle Removal:

Snag_1468f8c.png

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

 

Snag_146d791.png

Slide the Sleeve off of the assembly.
Parts Legend

Snag_1085426.png

6 Valve Body

Snag_fd8415.png

5 Adapter with Check Valves

Snag_fd6e5b.png

4 Pressure Balancing Puck

Snag_fc990a.png

3 Cartridge

Snag_fc79ba.png

2 Cartridge Nut

Snag_fc2acf.png

1 Installation Sleeve (Included with 1212 Cartridge kit)
Cartridge Removal and Valve Body Preparation

disassembly step 1.gif

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

disassembly step 2.gif

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

Snag_10d2667.png

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.
Re-Assembly: 4 Port Shower Only Valve (For 1212 M-Core Cartridge 2 Series: 3 Port Valve, Click Here)
Snag_11883c4.png

If you need to reinstall the Pressure Balancing Puck (4) and Adapter (5) into 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 assembly step 1 r2.gif

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

Snag_17cbaeb.png

Snag_13c19b1.png

4 port assembly step 2 r2.gif

 

Snag_11dc0c5.png

 Align 2 posts on Cartridge (3) 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 1/4 turn with a wrench.

For additional information on M-Core Shower products, visit Single Handle Shower: M-Core at Solutions.moen.com.

Still Not Finding What You're Looking For?

Contact Us or Call 1-800-BUY-MOEN

Non US? Moen Canada | Other International Sites

  1. Back to top
  • Was this article helpful?

Recommended articles

  1. Article type
    Topic
  2. Tags
    1. Shower Faucet-Cartridge Replacement