Genuine OEM Audi Coolant Line, part number 4K0121081BQ. This essential pipe is designed to transfer coolant within the engine cooling system, playing a vital role in maintaining optimal engine operating temperatures. Positioned within the radiator assembly, it ensures the efficient circulation of coolant to prevent overheating. Weighing just 0.016 kg and measuring approximately 220mm in length, this line is engineered for precise routing and durability. Using genuine OEM coolant lines guarantees the correct material composition, pressure resistance, and exact fitment, which are crucial for preventing leaks and ensuring the long-term reliability of the cooling system.