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

Cartridges:
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

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

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