Genuine OEM Audi Coolant Hose, part number 7M3122073AT. This specialized hose is designed to connect the auxiliary heater to the vehicle's main engine cooling system, facilitating the circulation of hot coolant for supplemental heating and cabin comfort. Its precise molded shape and durable material ensure a leak-free connection and reliable performance under varying temperatures and pressures. Choosing a genuine OEM hose guarantees the correct routing geometry, material resistance, and secure fitment for optimal auxiliary heater function.