Genuine OEM Audi Engine Coolant Return Hose, part number 059121447N. This hose is a critical component in the engine cooling system, responsible for returning coolant to the main cooling circuit. The diagram shows it as item 2, positioned at the lower section of the cooling assembly. Made from durable, heat-resistant rubber, it ensures a leak-free connection. Using genuine OEM hoses guarantees the correct routing, pressure resistance, and material compatibility for reliable cooling system performance.