Genuine OEM Volkswagen Coolant Hose, part number 2Q0121049EP. This hose transports coolant between engine components and the radiator to regulate engine temperature. It is located at position 1 in the diagram. The hose is constructed from durable rubber material designed to withstand high temperatures and pressures. Genuine OEM coolant hoses ensure precise fitment and long-lasting performance, preventing leaks and maintaining efficient engine cooling.