Genuine OEM Audi Coolant Line, part number 4K0121081BS. This line is an essential component of the engine cooling system, responsible for transporting coolant to maintain optimal engine operating temperatures. It is positioned within the complex network of cooling lines, ensuring proper fluid circulation. Weighing 0.05 kg and measuring approximately 0.665 m in length, a genuine OEM coolant line guarantees precise dimensions, durable material construction, and proper sealing surfaces, which are vital for preventing leaks and maintaining the integrity of the cooling system.