Genuine OEM Audi Coolant Hose with Coupling, part number 3Q0122051AR. This essential component is responsible for circulating engine coolant between various parts of the cooling system, such as the radiator, engine block, and heater core, to maintain optimal operating temperatures. It features an integrated coupling for a secure and leak-free connection within the cooling circuit. Constructed from durable, heat-resistant rubber and reinforced for pressure, this hose is designed to withstand the demanding conditions of the engine bay. Choosing a genuine OEM hose ensures precise routing geometry, correct material composition, and reliable performance, preventing leaks and maintaining the integrity of the cooling system.