Genuine OEM Audi Coolant Hose, part number 07K121109D. This hose is part of the engine's cooling system, designed to transport coolant between the engine and radiator or other cooling components. It is made from heat-resistant and pressure-tolerant rubber or silicone. Manufactured to exact specifications for proper routing and connection. Genuine OEM coolant hoses are essential for maintaining the correct coolant flow and preventing leaks, ensuring optimal engine temperature regulation and longevity.