Moen Brass M-CORE 2 or 3 Function Transfer Valve with CC/IPS Connections, U231CIFrom the manufacturer 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 freedom in terms of showering functionality and design in new construction or remodel