Genuine OEM Volkswagen Reducing Agent Injector Metering Line, part number 3Q0131984AE. This critical component is responsible for precisely delivering the reducing agent (such as AdBlue or DEF) from its reservoir to the injector within the vehicle's Selective Catalytic Reduction (SCR) emissions system. It ensures accurate metering and delivery for effective exhaust gas treatment. The line is constructed from durable, chemical-resistant materials, protected by a corrugated conduit, and weighs approximately 0.335 kg. Using a genuine OEM metering line guarantees the correct fluid resistance, pressure rating, and precise routing geometry for reliable operation and compliance with emissions standards.