M-CORE | Valves | Moen 101

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 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

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

3 Series Cartridges

1213 Cartridge

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

Cartridge:
The 1213 cartridge that come in M-CORE 3 Series trim provides water temperature and volume control

3 Port Valve Installation

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

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

CC/IPS

Cold Expansion Pex

Crimp Pex

CPVC (4 Port)

Pre-Fab Tub Drop

We made the system intuitive for customers.

M-CORE trim, valves and cartridges are thoughtfully numbered to assist customers and consumers

Trim:
M-CORE 3 Series SKU numbers are copies of the corresponding Moentrol SKU numbers with the addition of “U” prefix

Ex. Align Moentrol Valve Only trim: T3291 = Align M-CORE 3 Series Valve Only trim: UT3291
Exception: For Wynford, which does not start with a 3 today T5501, we have simply added a 3 = UT35501

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

Ex. Number of ports, number of functions, number of handles, connection type and with or without stops

Cartridge:
To tie to the trim functionality and naming convention, the 3 Series Cartridge will be SKU# 1213