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Check Valve Cold Water 15mm Quick Connect

Part #: Z4948
Check valve for the fresh water system used on the Catalina 320, later Catalina 42s, and other boats. If your boat has red and blue, rigid fresh water hoses, then this was the check valve used on your boat.
This check valve was also used on the Catalina 270, Catalina 28 MKII, Catalina 30 MKIII, Catalina 34, and Catalina 36 starting around 2002. It replaced the plastic check valve that was originally used on these boats.

Installed in the cold water line before the water heater to help prevent hot water from leaching back into the cold water side of the system.