Genuine OEM Audi Front Heater Ventilation Line, part number 4M0121081BG. This component is responsible for distributing heated air throughout the vehicle's cabin, ensuring effective climate control and passenger comfort. It is located in the front section of the HVAC system. The line is made from durable, flexible materials, measuring 0.79m in length. Selecting a genuine OEM ventilation line guarantees correct routing, secure connections, and resistance to temperature fluctuations, which are vital for a reliable heating and air conditioning system.