Genuine OEM Volkswagen Coolant Hose with Coolant Pump, part number 5Q0820499A. This part is integral to the engine cooling system, responsible for circulating coolant between the engine and the radiator, and includes a coolant pump. Its function is to maintain optimal engine operating temperature by managing heat exchange. Genuine OEM parts are manufactured to exact specifications, ensuring proper flow rates, material durability, and reliable performance in demanding engine conditions.