Genuine OEM Volkswagen Engine Air Filter Vacuum Hose, part number 04L131055A. This hose is an integral part of the air intake system, responsible for maintaining proper vacuum and airflow between various components, including the air filter box. Its precise routing and durable construction are essential for the engine's efficient operation and emission control. Using a genuine OEM hose guarantees exact fitment, correct material resistance to engine bay conditions, and reliable performance, preventing vacuum leaks and maintaining optimal engine function.