Genuine OEM Audi Coolant Hose with Coupling, part number 4K0122101BH. This hose is a vital component of the engine cooling system, responsible for transporting coolant between various parts, including the radiator. It features an integrated coupling for secure and quick connections. Constructed from durable, heat-resistant rubber, it maintains flexibility and integrity under high temperatures and pressures. Using a genuine OEM hose ensures precise routing, proper sealing, and resistance to degradation, preventing leaks and maintaining optimal engine cooling.