Genuine OEM Audi Rear HVAC Duct Adapter, part number 4M0815215A. This component is designed to connect different sections of the heating, ventilation, and air conditioning (HVAC) ductwork, specifically for the rear of the vehicle. Its function is to ensure a sealed and efficient pathway for conditioned air to reach the rear cabin, maintaining passenger comfort. Weighing 0.075 kg and measuring 0.225 m in length, this adapter is engineered for precise fitment within the complex HVAC system. Choosing a genuine OEM duct adapter guarantees exact dimensions, proper sealing, and durable material construction, preventing air leaks and ensuring efficient climate control throughout the vehicle.