Genuine OEM Audi Reduction Agent Supply Line, part number 2Q0131984A. This line is crucial for delivering the reduction agent (such as AdBlue or DEF) to the vehicle's emissions system, facilitating the reduction of harmful nitrogen oxides. It is an integral component within the selective catalytic reduction (SCR) system. Weighing approximately 0.313 kg, this line is designed for precise routing and connection. Using a genuine OEM supply line ensures proper fluid transfer, leak-free operation, and chemical compatibility with the reduction agent, which is vital for the longevity and efficiency of the entire emissions control system.