Genuine OEM Audi Expansion Tank Coolant Hose, part number 8K0121081P. This flexible hose is an important component of the engine cooling system, specifically designed to connect the expansion tank to the main cooling circuit. It manages coolant volume changes due to temperature fluctuations. Weighing 0.038 kg and measuring 0.49m in length, this hose features specific bends for exact fitment. Choosing genuine OEM guarantees the correct routing, optimal flexibility, and superior resistance to coolant chemicals and temperature variations for reliable performance.