Genuine OEM Audi Coolant Hose, part number 3D0122157AG. This hose is a critical component of the engine cooling system, responsible for circulating coolant between various engine parts to maintain optimal operating temperatures. It features a specific curved geometry to ensure correct routing and fitment within the engine bay. Constructed from high-quality, heat-resistant rubber, it weighs approximately 0.18 kg. Using a genuine OEM coolant hose guarantees the correct material composition for resistance to heat and pressure, precise internal diameter for proper flow, and exact molded shape for leak-free connections and long-term durability.