Genuine OEM Audi Filling Line for Reducing Agent, part number 8K0131963F. This flexible hose is part of the system that supplies reducing agent (like AdBlue) to the exhaust system for emissions control. It connects the reducing agent tank to the injection point. Manufactured to strict OEM standards, this line ensures leak-free operation and correct fluid flow. Genuine OEM parts are critical for emissions systems to maintain precise calibration and prevent leaks.