Genuine OEM Audi Coolant Hose, part number 4H0121056N. This hose is a vital component of the engine cooling system, responsible for circulating coolant to maintain optimal engine operating temperature. It ensures efficient heat dissipation and prevents overheating. Measuring 0.51m in length and weighing 0.186 kg, this genuine OEM hose provides the correct routing geometry and material resistance for reliable coolant flow and long-term durability.