Genuine OEM Audi Engine Block Breather Valve, part number 035103245A. This valve plays a crucial role in regulating crankcase pressure, allowing blow-by gases to escape while preventing excessive vacuum or pressure buildup. Proper function is vital for engine health and emissions control. Made from durable, oil-resistant plastics and rubber, it ensures reliable operation in the engine environment. Genuine OEM valves provide precise calibration and material integrity, critical for maintaining optimal crankcase ventilation and preventing oil leaks or engine damage.