for PIAGGIO Sfera NSL (’91-’94) 50ccm/ Sfera 80ccm Product description These air filter elements from PIAGGIO/RMS are standard rated elements, used as OEM parts by many scooter manufacturers. Top quality at affordable prices! Some air filter elements produced by PIAGGIO are also available as PREMIUM rated elements. These offer the advantage of an increased air flow of air while simultaneously reducing the amount of contaminating particles reaching the carburettor and motor. This improves the performance of the motor. They are also produced using a more high end material. Do not forget to impregnate your new filter element with a suitable filter oil (#14241000) before use! OEM numbers (for comparisons): 257369 (PIAGGIO)