Genuine OEM Volkswagen Lower Radiator Coolant Hose, part number 7H0121051D. This hose connects the lower part of the radiator to the engine, facilitating the circulation of coolant. Proper coolant flow is essential for maintaining optimal engine temperature and preventing overheating. Made from durable, heat-resistant rubber. Genuine OEM hoses are built for specific temperature and pressure resistance, ensuring long service life.