Motorcycle Air Filter Intake Adapter Fit K&N Fit For Yamaha Yfz450 All Year This filter adaptor is custom designed to fit into your existing factory air box Use with K&N Air Filter Part #RU-4740 Easy to install in factory air box Includes 1 custom-made heavy duty plastic adaptor and hardwares. (K&N air filter is not included) Condition: 100% Brand New ,,,,