These Airbox Covers prevent water and bike cleaner from entering your intake when cleaning the airbox. Airbox Covers are manufactured from tough, durable ABS plastic. A rubber sealing ring is provided to ensure a perfect, leak-free fit. To use, simply remove your air filter from the airbox and install the Airbox Cover with the provided mounting screw (if required). FITMENT GAS GAS EC 200 18-20 EC 250 18-20 EC 300 18-20 XC 200 18-20 XC 250 18-20 XC 300 18-20 RIEJU MR250-300 21-23