Genuine OEM BMW Cylinder Head Cover Breather, part number 11127809512. This component is part of the engine's crankcase ventilation system, helping to release pressure and remove harmful vapors from the crankcase. It ensures proper airflow and prevents oil contamination. Constructed from durable materials, it is designed to maintain its function under engine operating conditions. Genuine OEM parts ensure the correct flow rates and sealing for optimal engine performance and longevity.