Genuine OEM Volkswagen Coolant Return Hose, part number 7E0122051F. This hose is a vital component of the engine cooling system, responsible for carrying coolant that has circulated through the engine back to the radiator for cooling. It weighs approximately 0.503 kg with dimensions of 0.52m x 0.195m x 0.15m. Using a genuine OEM coolant hose ensures the correct routing, flexibility, and resistance to heat and pressure, which are essential for preventing leaks and maintaining optimal engine operating temperatures.