Genuine OEM Volkswagen Coolant Hose, part number 3Q0121157. This hose is a critical component of the engine cooling system, responsible for circulating coolant between engine components and the radiator. It is located in the engine bay, connecting to various parts of the cooling circuit. Constructed from high-quality, heat-resistant rubber and reinforced materials for durability and leak-free operation. Genuine OEM hoses are manufactured to exact specifications for proper fit and to withstand the high temperatures and pressures of the cooling system.