From simple single-head showers to custom showers featuring multiple outlets, valves are a critical component to any shower application.

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

Moen Standard Shower Valve
Shower Spa Valves Anatomy

Product Detail

Anatomy of a Valve

Every shower has a valve that acts like an engine — shifting flow, regulating temperature and driving performance — and there are many options of design, functionality and operation suited to different applications.

The valve is placed behind the wall and connects directly to the hot and cold water lines to regulate flow and temperature. Most valves are available in a variety of connection types. A cartridge inserted into the valve connects to the external trim handles to control the mixture of hot and cold water and flow through the faucet based on the handle position.

With any Moen valve, you can be certain of unsurpassed safety, comfort and reliability since our valves meet applicable pressure-balancing or thermostatic safety codes and eliminate worry about hot or cold water surges. Plus, you can rely on our quality construction and dependable operation since each valve is backed by our Limited Lifetime Warranty.

Product Line

Overview of Moen Valve Models

U by Moen™ Shower

Digital thermostatic with computer and mobile app-controlled temperature and flow.

ExactTemp® ¾” Thermostatic Valve

Mechanical thermostatic control.

M-CORE Transfer Valve

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

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

Posi-Temp® Valve

Pressure-balancing cycling valve.

Two- or Three-Function Transfer Valve

Directs water flow to spray outlets.


M-CORE 231 and 361 Transfer Valves

Browser Transfer Valves


M-CORE 130 and 140 Mixing Valves

Browse Mixing Valves

Comparison Chart

See side-by-side comparisons on our valve comparison chart.

View PDF


There are a variety of terms attached to valve function. Here are quick-reference definitions for a few of the most common:


Protects users from "shower shock" due to a sudden change in either hot- or cold-water pressure elsewhere in the plumbing system (i.e., toilet flush). Pressure-balancing valves are designed to detect the pressure drop and automatically adjust the flow of water to maintain a consistent water temperature.


These valves use a device to keep temperature consistent. They typically require a separate volume-control function, such as a transfer valve.

Cycling Valve

Turns on and off, cycling counter clockwise from cold (6 o'clock) to hot (9 o'clock). Does not provide volume control.

Volume Control

Allows the user to adjust water flow rates as other plumbing fixtures connected to the line are in use.

Helpful Resources

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