Genuine OEM Volkswagen Coolant Hose, part number 3QF121058. This hose is a critical component of the engine's cooling system, responsible for carrying coolant between the engine and radiator or other cooling components. It is located in the engine bay, connecting various parts of the cooling circuit. Constructed from high-quality, heat-resistant rubber, this hose is designed to withstand the pressures and temperatures of the cooling system. Genuine OEM coolant hoses are essential for maintaining proper engine temperature and preventing leaks, ensuring the longevity of the cooling system.