Moen® M-CORE™ Valve System

Introducing M-CORE, a valve system that's simpler and faster to install, and offers functionality with desired style choices to create an ideal shower system. We've conducted extensive research to create M-CORE, and what drove the design was a passion to make the workday more streamlined for installers and to give more freedome in terms of showering functionality and design in new construction or remodel projects.

This section is designed to provide a basic overview of all of Moen's M-CORE valve options to help identify which valve you are working with, as well as troubleshooting information.

Moen M-CORE Valve
MCORE Plumber Hands
MCORE Stacking Valve
MCORE Plumber Drill Wall
MCORE Transfer Valve

Moen M-CORE 3 Port Valves

Two inlets and one outlet
Use for Shower Only systems or pair with a transfer valve to create a multiple showering device system

Moen M-CORE 4 Port Valves

Two inlets and two outlets
Use for Tub/Shower systems or pair with a transfer valve to create a multiple showering device system

Moen M-CORE Transfer Valves

One inlet and three outlets
Pair with a mixing valve to create two or three showering device systems

Moen M-CORE With Integrated Transfer Valve

Two mixing valve inlets and three  transfer valve outlets
A mixing and transfer valve combined to create two or three showering device systems

Moen M-CORE Installation Benefits
MCore Easy Installation and Increased Functionality

Easy Installation & Increased Functionality

Easy Installation

Integrated mounting bracket, mounts flat to brace

Transfer Valve Inlet aligns with Mixing Valve outlet

Simple cartridge modification to change the valve’s flow from two outlets to three outlets

For M-CORE Transfer Valves, cartridges will be included with the valve

Increased Functionality

2F/3F (U231) Independent 

3F/6F (U361) Shared

M-CORE transfer valves can control 2 or (NEW) 3 showering devices

6-Function (U361)- When using 3 showering devices, the valve has 3 independent and 3 shared functionality 

M-CORE Cartridges

1213 Installation

M-CORE 2-Series & 3-Series Cartridges

Adaptor with Check Valves:
Prevents cross flow of water between hot and cold water lines

Pressure Balance Puck:
Balances incoming hot and cold water pressure to compensate for fluctuations in the home’s water flow, keeping shower temperatures constant and comfortable

2-Series (1212): The 1212 cartridge that comes with the M-CORE 2-Series trim provides water temperature control

3-Series (1213): The 1213 cartridge that comes with M-CORE 3 Series trim provides water temperature and volume control

3 Port Valve Installation

3 Port Valve Installation

For 3-Port Valves, flip Adapter with Check Valves (180 degrees) so wing is at top.

4 Port Valve Installation

4 Port Valve Installation

The three components of the mixing valve cartridge ship assembled and ready for install into a 4-port mixing valve.

M-CORE Connection Types
Cold Expansion Pex ConnectionCold Expansion Pex
Crimp Pex ConnectionCrimp Pex
CPVC (4 Port) ConnectionCPVC (4 Port)
Pre-Fabricated Tub Drop ConnectionPre-Fab Tub Drop

Product Line

Overview of Moen M-CORE Valve Types

Moen M-CORE Valve Options
Let Us Help You Get Started

How-To Videos

The Numbering System Valve Key


An intuitive valve and trim numbering system make ordering M-CORE universal valves an easy process.

M-CORE 2-Series SKU numbers are copies of the corresponding Posi-Temp SKU numbers with the addition of a “U” prefix.

Example: Align® Posi-Temp® Valve-Only Trim: T2191 = Align M-CORE 2-Series Valve-Only Trim: UT2191

M-CORE 3-Series trim SKU numbers are copies of the corresponding Moentrol® SKU numbers with the addition of a “U” prefix.

Example: Align® Moentrol Valve-Only Trim: T3291 = Align M-CORE 3-Series Valve-Only Trim: UT3291

Each character in an M-CORE valve SKU number reflects the features and benefits of that valve.

Examples: Number of ports, number of functions, number of handles, connection type, and with or without stops

To tie to the trim functionality and naming convention, the 2-Series Cartridge will be SKU# 1212, and the 3-Series Cartridge will be SKU# 1213.

Moen M-CORE Finish and Trim Options

Helpful Resources

Visit our troubleshooting guide or watch a video tutorial for installation advice and guidance.