Genuine OEM Volkswagen Breather Hose, part number 03C103474J. This hose is a component of the crankcase ventilation system, designed to route blow-by gases from the crankcase back into the intake system for re-combustion. It helps to reduce emissions and prevent pressure buildup within the engine. Constructed from durable rubber and plastic materials to resist oil and heat. Genuine OEM parts are manufactured to exact specifications, ensuring proper fitment and reliable performance in the engine's ventilation system.