This fuel cap gas is compatible with the corresponding model of Yamaha ATV/SxS and is the perfect accessory for modifying and restoring Yamaha ATV/SxS.The purpose of your gas cap is to prevent liquid fuel or fuel vapors from traveling up the fuel filler neck and out of the system through the fuel door. This not only helps limit fuel evaporation that can contribute to poor gas mileage but also reduces the risk of vapors from the gas tank polluting the air.This fuel cap prevents dust sand and other small debris from entering the tank and will not leak at high speeds or when the vehicle is tilted.