Genuine OEM Volkswagen Coolant Pipe, part number 5QK816738A. This pipe transports coolant within the vehicle's cooling system, connecting to the inner heat exchanger. It is crucial for maintaining optimal engine temperature by facilitating coolant flow. This part is located at position 30 in the diagram. Genuine OEM coolant pipes are manufactured to precise specifications to ensure proper fitment and resistance to heat and pressure, preventing leaks and maintaining system integrity.