Genuine OEM Audi Coolant Hose with Coupling, part number 4K2122109J. This hose transports coolant within the engine cooling system, featuring an integrated coupling for secure and leak-free connection. It connects to the radiator. Weighing approximately 0.13 kg, this hose is designed to withstand the high temperatures and pressures of the cooling system. Using a genuine OEM hose ensures correct routing, material integrity, and the reliability of the coupling, critical for preventing coolant leaks and maintaining engine health.