Genuine OEM Audi Reducing Agent Tank Suction Line, part number 4H0131237. This line is a critical component in the emissions control system, responsible for drawing reducing agent (such as AdBlue) from its storage tank. This agent is then injected into the exhaust stream to reduce harmful nitrogen oxides. Weighing approximately 0.03 kg, this line is designed for precise fluid transfer. Using a genuine OEM suction line ensures proper material compatibility with the reducing agent and maintains the integrity of the emissions system.