Genuine OEM Volkswagen Coolant Hose with Coupling, part number 3Q0122101AJ. This hose is a critical component of the engine cooling system, designed to transport coolant between various engine components. It features a quick-release coupling for secure and efficient connection and disconnection. The hose is engineered to withstand high temperatures and pressures within the cooling system. Choosing a genuine OEM coolant hose ensures correct routing geometry, material resistance to coolant chemicals, and reliable sealing at connection points, preventing leaks and maintaining optimal engine temperature.