Genuine OEM Audi Coolant Hose, part number 1K0121101AA. This hose is designed to transport coolant between various engine components, playing a critical role in maintaining optimal engine operating temperature. It connects to the radiator and other parts of the cooling system. Weighing 0.247 kg and measuring 0.42 m in length, this hose is engineered for precise fitment. Choosing a genuine OEM coolant hose ensures the correct routing geometry, material composition, and resistance to engine fluids and temperatures, preventing leaks and premature failure.