Genuine OEM BMW Engine Crankcase Breather Hose, part number 11151703775. This hose is designed to route crankcase gases away from the engine, contributing to proper ventilation and preventing pressure buildup. It connects to the crankcase and the intake system or emission control system. Made from flexible, oil-resistant rubber to withstand engine bay conditions. Genuine OEM hoses ensure correct fitment and material integrity for reliable operation.