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). AIRBOX COVER HONDA CRF250R 18-21 CRF450R 17-20 CRF250RX 19-21 CRF450RX 17-20