Genuine OEM Audi Coolant Hose, part number 420260701D. This hose is a critical component of the engine's cooling system, responsible for transporting coolant between various parts such as the radiator, engine block, and heater core. It is positioned within the engine bay, connecting to other cooling system components. Constructed from heat-resistant rubber and reinforced materials, it is designed to withstand high temperatures and pressures. Genuine OEM coolant hoses are essential for maintaining the integrity of the cooling system, preventing leaks and ensuring optimal engine temperature regulation.