Genuine OEM Audi Heater Coolant Return Pipe, part number 7L0819926AJ. This pipe is a vital component of the vehicle's heating and cooling system, specifically designed to return coolant from the heater core back into the main circulation. This ensures efficient cabin heating and proper thermal management. The pipe measures approximately 0.63 meters in length and weighs 0.233 kg. Choosing a genuine OEM heater coolant return pipe guarantees the correct material resistance to coolant, precise bends for proper routing, and leak-free connections, preventing coolant leaks and maintaining optimal HVAC performance.