The Rheem Water Control Valve Kit with O-Ring, part number RTG20329AV, is a vital component for Rheem tankless gas water heater systems. This comprehensive kit includes a water control valve and O-ring, ensuring precise regulation of water flow within the unit. Engineered for durability and performance, it helps maintain optimal water temperature and pressure. Specifically designed for Rheem units, this kit ensures efficient operation, providing reliable hot water supply for residential and commercial applications.