Genuine OEM Audi Coolant Hose, part number 4F0121472E. This hose is designed to transport coolant efficiently within the engine cooling system, facilitating heat exchange and maintaining optimal engine temperature. It is located in the upper engine bay, connecting to a main coolant pipe. Constructed from durable, heat-resistant rubber, it measures approximately 0.425m in length. Choosing a genuine OEM coolant hose ensures the correct routing geometry, material composition, and pressure resistance for a leak-free and long-lasting cooling system.