Genuine OEM Audi Engine Breather Hose, part number 03L103493E. This hose is an integral part of the Positive Crankcase Ventilation (PCV) system, managing engine crankcase ventilation and emissions. It routes blow-by gases from the crankcase back into the intake manifold to be re-burned. Weighing 0.109 kg, this corrugated plastic hose is designed for durability and proper routing. Using a genuine OEM hose ensures correct routing geometry, material resistance to oil and heat, and proper sealing, which is essential for maintaining engine efficiency and emissions compliance.