Genuine OEM Volkswagen Coolant Hose, part number 057121177. This hose is a vital component of the engine cooling system, responsible for circulating coolant. It connects to the oil cooler, ensuring that both engine oil and coolant are maintained at optimal operating temperatures. Made from heat-resistant and pressure-tolerant rubber. Genuine OEM coolant hoses are designed with precise internal diameters and routing to prevent leaks and ensure efficient heat transfer.