Genuine OEM Audi Coolant Line, part number 4K0121081BR. This line is crucial for transporting coolant throughout the engine cooling system, helping to regulate engine temperature. It connects to the radiator and other cooling components. Weighing approximately 0.022 kg and measuring 0.29 m in length, this line is designed for precise fitment and durability. Choosing a genuine OEM coolant line ensures proper routing, material integrity, and resistance to temperature and pressure fluctuations, preventing leaks and maintaining cooling system efficiency.