Genuine OEM BMW engine vent pipe hose, part number 11158647961. This hose is a critical component of the crankcase ventilation system, responsible for routing air and oil vapors back into the intake system. It is constructed with factory-molded ends for a secure, leak-free connection. Genuine OEM parts are vital for this hose to ensure correct routing geometry and resistance to oil degradation, preventing vacuum leaks that can negatively impact engine performance.