Genuine OEM Volkswagen Vacuum Hose Assembly, part number 03H133778BT. This assembly is responsible for routing vacuum pressure to various engine components, ensuring proper operation of systems like the brake booster or emissions controls. It is located within the engine bay, connecting to multiple ports. Constructed from high-quality, durable rubber and plastic for long-lasting service. Genuine OEM parts are manufactured to precise specifications, guaranteeing correct vacuum flow and preventing leaks that could affect engine performance.