Genuine OEM Volkswagen Coolant Hose, part number 5C0122101L. This hose transports coolant and may be integrated with systems related to the dual-clutch gearbox for optimal performance. It is positioned as part 1 in the diagram. Constructed from high-quality materials to ensure longevity and resistance to coolant and heat. Genuine OEM hoses provide the correct dimensions and material properties for safe and efficient engine cooling.