Genuine OEM Audi Heater Water Control Valve, part number 400820036A. This valve is a crucial component in the vehicle's heating and air conditioning system, regulating the flow of hot water to the heater core. By controlling this flow, it allows for precise adjustment of the cabin temperature. Constructed from durable, heat-resistant plastic, this valve weighs 0.543 kg. Opting for a genuine OEM control valve ensures accurate calibration, reliable operation, and proper integration with the vehicle's climate control system, preventing issues like inconsistent heating or leaks.