Genuine OEM Audi Coolant Hose, part number 1K0121156BN. This essential component is designed to transport coolant efficiently throughout the engine cooling system, playing a crucial role in maintaining optimal engine operating temperatures. Weighing approximately 0.2115 kg and measuring 0.365 meters in length, this hose is manufactured to precise factory specifications. Choosing a genuine OEM coolant hose ensures correct material composition for heat and pressure resistance, exact routing geometry, and secure connections, which are vital for preventing leaks and ensuring the longevity of the cooling system.