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 BETA MX 300 RX 24- 450 RX 24- BETA ENDURO 125RR 20-24 200RR 20-24 250RR 20-24 300RR 20-24 350RR 20-24 390RR 20-24 430RR 20-24 480RR 20-24 250 X-TRAINER 23-24 300 X-TRAINER 23-24