Genuine OEM Volkswagen Injector Metering Line, part number 3Q0131984AH. This metering line is a crucial component of the reducing agent (e.g., AdBlue) injection system, responsible for delivering the precise amount of fluid to the injector. It connects the pump or reservoir to the injector. Manufactured from durable materials resistant to the reducing agent and operating temperatures. Genuine OEM metering lines ensure the correct flow rate and prevent leaks, which is vital for emissions control and system efficiency.