Genuine OEM Audi Breather Hose, part number 03L103493AC. This hose is a crucial part of the engine's crankcase ventilation system, designed to safely channel gases away from the crankcase. Proper ventilation prevents pressure buildup and helps maintain oil cleanliness, contributing to engine longevity. Its flexible, corrugated design allows for specific routing and vibration absorption. Manufactured from durable, oil-resistant materials, a genuine OEM breather hose ensures a secure, leak-free connection and reliable performance under engine operating conditions.