Genuine OEM Audi Intake Vacuum System Hose, part number 06H133781Q. This hose is an integral part of the engine's intake vacuum system, connecting various components to maintain precise vacuum pressure. Proper vacuum is crucial for the operation of several engine systems, including emissions control and brake assist. Its durable, heat-resistant material and exact routing ensure a leak-free connection and reliable performance, which is essential for maintaining engine efficiency and preventing vacuum leaks.