Genuine OEM Audi Battery Degassing Grommet, part number 8W0915143A. This essential component is designed to facilitate the safe escape of gases produced by the battery, preventing pressure buildup and ensuring proper ventilation. It connects the battery to the degassing hose, typically located in the battery compartment. Weighing approximately 0.013 kg, it is made from durable, chemical-resistant rubber or plastic. Using a genuine OEM grommet ensures a perfect seal and proper gas routing, critical for battery safety and longevity.