Genuine OEM Volkswagen Coolant Hose, part number 3Q0122073J. This hose is an essential component of the engine cooling system, responsible for transporting coolant between various engine components to regulate temperature. Its complex routing geometry ensures proper flow and heat dissipation. Constructed from high-quality, heat-resistant rubber, this genuine OEM hose guarantees correct routing, fluid resistance, and leak-free performance, preventing engine overheating.