Genuine OEM Volkswagen Coolant Balancing Container Hose, part number 6C0122109B. This hose is crucial for transferring coolant to and from the balancing container (expansion tank) within the engine cooling system. It ensures proper fluid circulation and pressure regulation. The hose weighs approximately 0.245 kg and measures 0.42m in length. Using a genuine OEM hose guarantees correct routing geometry, material resistance to coolant, and reliable performance under engine operating temperatures and pressures.