Genuine OEM Audi Radiator Coolant Hose, part number 1K0121101R. This hose is a critical link in the engine cooling system, connecting the radiator to the engine to facilitate the circulation of coolant. It is positioned as part of the primary coolant flow path. Weighing 0.0897 kg, this hose measures 0.138m in length. Using a genuine OEM radiator hose ensures the correct internal diameter, material flexibility, and resistance to high temperatures and pressures, which are vital for preventing leaks and maintaining efficient engine cooling.