Genuine OEM Volkswagen Coolant Hose, part number 5C0121109D. This hose plays a vital role in the engine's thermal management by transporting coolant between critical engine components to prevent overheating. It is located in the cooling system as indicated by number 20 on the diagram. Constructed from high-quality materials, it ensures a reliable connection and efficient coolant flow. Genuine OEM coolant hoses are engineered for exact fit and lasting performance, crucial for maintaining optimal engine temperature.