The Rheem Check Valve - Fan, part number RTG20319CL, is a vital component designed for Rheem tankless gas water heater systems. This specialized valve ensures proper airflow direction within the unit's fan system, preventing backflow and optimizing performance. Engineered with durability and efficiency in mind, it features precision construction to withstand demanding conditions. Specifically tailored for Rheem units, this check valve ensures optimal functionality, contributing to reliable heating performance and uninterrupted hot water supply for residential and commercial applications.