Genuine OEM Audi Coolant Hose, part number 5N0121086E. This hose is specifically designed to transfer coolant to or from the transmission oil cooler, playing a critical role in maintaining the transmission's operating temperature. It is positioned within the engine cooling system, connecting to the transmission oil cooler. Weighing 0.229 kg and measuring 0.36m x 0.17m x 0.1m, this hose is constructed from high-quality, heat-resistant rubber compounds. Using a genuine OEM coolant hose ensures precise routing, proper sealing, and resistance to thermal cycling and pressure, which is essential for preventing leaks and maintaining efficient cooling system performance.