The Rheem Manifold Assembly Kit with Gas Proportional Valve (For NAT), part number RTG20329D, is a comprehensive component for Rheem tankless gas water heater systems. This kit includes a manifold assembly with a gas proportional valve, crucial for regulating gas flow and achieving precise heating control. Engineered for natural gas compatibility, it ensures optimal performance and efficiency. Specifically tailored for Rheem units, this assembly kit guarantees reliable operation, providing consistent hot water supply for residential and commercial applications.