Genuine OEM Audi Engine Radiator Coolant Pipe, part number 4KE121081H. This pipe directs coolant between the engine and radiator, playing a critical role in the vehicle's thermal management system. It ensures efficient circulation of coolant to maintain optimal engine temperature. Weighing 0.012 kg and measuring 0.163 m in length, its rigid construction and precise routing are essential for maintaining system integrity and preventing leaks under pressure.