Genuine OEM Audi Radiator Coolant Hose, part number 4H0121058G. This hose transports coolant between the engine and radiator, playing a critical role in regulating engine temperature. It is positioned on the front left side of the cooling system. Weighing 0.131 kg and measuring approximately 0.182 m in length, this hose is designed for precise fitment and optimal fluid flow. Choosing a genuine OEM hose ensures the correct routing geometry, material composition, and resistance to heat and pressure for reliable, leak-free performance.