Genuine OEM Audi Coolant Hose With Coupling, part number 8K0121101K. This hose is an essential component of the engine cooling system, responsible for transporting engine coolant between various parts, including the radiator. It is typically found within the engine bay, connecting cooling system components. This hose is designed with an integrated coupling for secure and leak-free attachment. Using a genuine OEM coolant hose ensures proper routing, resistance to high temperatures and pressures, and long-term durability against coolant degradation.