Genuine OEM Porsche Accessory Drive Belt, part number 99919230550. This belt is designed to transfer power from the engine's crankshaft to various essential accessories such as the alternator, air conditioning compressor, and water pump. It is a critical component for the overall operation of the vehicle's systems. The belt has a length of 0.87 meters and a width of 0.28933 meters. Genuine OEM belts are manufactured to precise specifications, ensuring correct tension, optimal material composition for durability, and exact pulley engagement, which is crucial for reliable accessory operation.