Genuine OEM Audi Coolant Hose with Coupling, part number 9J1121623B. This hose is designed to transfer coolant efficiently between various engine components and the radiator, playing a critical role in the vehicle's thermal management system. It is positioned within the engine cooling system, connecting directly to the radiator. Weighing 0.1586 kg and measuring 0.295 m in length, this hose is engineered for precise fitment and leak-free operation. Choosing a genuine OEM coolant hose ensures the correct material composition, routing geometry, and coupling design for reliable, long-term performance under varying temperature and pressure conditions.