Genuine OEM Volkswagen Breather Vent Pipe, part number 03C103558G. This pipe is an integral part of the crankcase ventilation system, designed to allow blow-by gases and oil vapor to escape from the engine crankcase. This prevents excessive pressure buildup within the engine, which could lead to oil leaks and seal damage. It typically connects the crankcase to the intake manifold or air intake system. Weighing 0.0545 kg, this pipe is constructed from durable, flexible plastic or rubber, often with a corrugated section and an integrated valve. Choosing a genuine OEM breather vent pipe ensures correct material composition for resistance to oil and heat, precise routing, and proper valve function, which are crucial for maintaining engine cleanliness and preventing internal pressure issues.