Genuine OEM BMW Crankcase Vent Hose, part number 11157533346. This hose allows for the ventilation of crankcase gases, preventing pressure buildup within the engine. It connects to the crankcase and routes gases to the intake system or emission control. The part is approximately 0.28 meters long. Genuine OEM hoses are manufactured to exact specifications for proper fit and material integrity, ensuring reliable ventilation and preventing leaks.