Genuine OEM Volkswagen Expansion Tank Hose, part number 7E0121447F. This hose is crucial for maintaining the correct coolant level and pressure by connecting the expansion tank to the main cooling circuit. It is positioned between the expansion tank and the cooling system. Weighing 0.0493 kg and measuring 0.28m in length, this hose is engineered to withstand temperature and pressure fluctuations, ensuring a leak-free and durable connection essential for optimal engine cooling.