Genuine OEM Audi Coolant Hose, part number 4K0122449D. This essential component is part of the engine cooling system, responsible for transporting hot coolant from the engine to the radiator for heat dissipation, and returning cooled fluid. It is specifically shown connecting to the radiator. Weighing 0.148 kg and measuring 0.23m in length, this hose is designed with specific bends and diameters for optimal flow. Choosing a genuine OEM coolant hose ensures the correct material composition to withstand high temperatures and pressures, along with precise routing geometry to prevent kinking and leaks, critical for maintaining engine temperature.