Genuine OEM Audi Engine Breather Line, part number 4G0121081DA. This hose allows for the ventilation of engine crankcase gases, preventing pressure buildup and maintaining engine health. It is positioned at the rear right of the engine assembly. Made from durable, heat-resistant material, it ensures a secure connection and long service life. Opting for a genuine OEM breather line ensures precise fitment, correct routing geometry, and material integrity to withstand engine operating conditions.