Genuine OEM Audi Breather Hose, part number 03L103493AB. This hose is a critical component of the crankcase ventilation system, designed to allow engine gases to escape and prevent pressure buildup. It is typically located within the engine assembly. Made from durable, corrugated material, it ensures a secure and leak-free connection. Using a genuine OEM part guarantees the correct routing geometry and material resistance to engine contaminants, crucial for long-term reliability and emissions compliance.