Genuine OEM Audi Coolant Hose, part number 03L122157F. This hose is a critical component of the engine cooling system, responsible for circulating coolant between the engine and the radiator. It is located in the engine bay, connecting various cooling system components. Constructed from durable, heat-resistant rubber designed to withstand high temperatures and pressures. Genuine OEM coolant hoses are manufactured to exact specifications for a leak-free fit and optimal coolant flow.