Genuine OEM Audi Engine Coolant Return Hose, part number 059121449M. This critical component is responsible for returning heated coolant from various engine components back into the main cooling circuit for recirculation. Constructed from high-quality, heat-resistant rubber, it ensures a leak-free connection and withstands engine bay temperatures and pressures. Choosing genuine OEM guarantees the correct routing geometry, material composition, and secure connections for reliable cooling system performance.