Genuine OEM Audi Coolant Hose, part number 4F0121107AF. This hose is a critical component of the engine cooling system, responsible for transporting coolant between engine components and the radiator. It is positioned within the engine cooling assembly. Constructed from durable materials to withstand high temperatures and pressures, ensuring reliable coolant circulation. Genuine OEM parts are manufactured to exact specifications for optimal fit and performance, ensuring the integrity of your cooling system.