Genuine OEM Audi Coolant Hose, part number 4E0121449AE. This hose is a vital component of the engine's cooling system, responsible for transporting coolant. It is positioned within the engine cooling assembly. Made from durable rubber, it is engineered to withstand the demanding conditions of the engine bay. Genuine OEM coolant hoses are manufactured to precise specifications, ensuring proper fitment and resistance to degradation for optimal cooling system performance.