Genuine OEM Audi Engine Vacuum Hose, part number 4L0133778. This hose is an integral part of the engine's vacuum system, responsible for carrying vacuum pressure to various engine components. Proper vacuum supply is essential for functions such as brake boosting, emissions control, and turbocharger regulation. The hose is lightweight at 0.015 kg and measures approximately 0.12 meters in length. Opting for a genuine OEM vacuum hose guarantees the correct material composition, precise dimensions, and resistance to collapse or cracking, which are critical for maintaining engine efficiency and preventing vacuum leaks.