Genuine OEM Volkswagen Coolant Hose, part number 1K0121096BS. This hose is a critical component in the engine cooling system, responsible for transporting coolant between various engine parts and the radiator. It is located in the engine bay, as indicated by position 30 on the diagram. Made from durable rubberized material designed to withstand high temperatures and pressures. Genuine OEM coolant hoses are manufactured to exact specifications, ensuring proper fitment and long-term reliability, preventing leaks and maintaining optimal engine operating temperature.