Genuine OEM Volkswagen Return Coolant Hose, part number 7E0122051L. This hose is responsible for returning cooled engine coolant from the radiator back into the engine's cooling system, maintaining optimal operating temperature. It is located as part of the radiator's lower connections. Weighing 0.44 kg, it measures 0.38 meters in length, 0.2 meters in width, and 0.1 meters in height. Choosing a genuine OEM coolant hose ensures the correct material composition, internal diameter, and routing geometry for reliable fluid flow and resistance to heat and pressure.