Genuine OEM Audi Cylinder Head Cover Vent Hose, part number 03C103558M. This hose plays a crucial role in the engine's ventilation system by routing crankcase gases away from the cylinder head, preventing pressure buildup and oil contamination. It is typically connected to the cylinder head cover and the intake system. Weighing 0.055 kg, this hose is constructed from durable, flexible material designed to withstand engine temperatures and oil vapors. Using a genuine OEM vent hose ensures correct routing, proper sealing, and resistance to degradation, maintaining optimal engine health and emissions compliance.