Genuine OEM Audi Coolant Hose, part number 4M0121056AF. This hose is responsible for transferring coolant between various engine components, playing a critical role in maintaining optimal engine operating temperature. Its specific routing and connections ensure efficient coolant flow within the cooling system. Weighing 0.106 kg, this genuine OEM hose is engineered for high-temperature resistance and durability, crucial for preventing leaks and ensuring the long-term health of the engine.