Genuine OEM Volkswagen Engine Vacuum Valve, part number 2H0121805A. This valve precisely regulates vacuum flow within the engine system, which is critical for the operation of components like the brake booster, emissions controls, and turbocharger bypass. It is typically located within the engine bay, connected to various vacuum lines. Constructed from durable automotive-grade plastic, this lightweight valve weighs approximately 0.18 kg. A genuine OEM vacuum valve ensures accurate pressure regulation, proper sealing, and long-term reliability, preventing vacuum leaks and maintaining optimal engine performance.