Genuine OEM Audi Reducing Agent Transfer Line, part number 4N0131960B. This critical component is responsible for safely transporting the reducing agent, such as AdBlue or Diesel Exhaust Fluid (DEF), to the emissions control system. It is an integral part of the vehicle's selective catalytic reduction (SCR) system. Genuine OEM lines are engineered for precise routing geometry and material compatibility, preventing leaks and ensuring the integrity of the emissions system.