Our fuel tank cap for the Predator 224cc 6.6 HP Mini bike / go-kart engine is a perfect solution to a missing fuel cap. This replacement cap is identical to what would come on a new Predator fresh from the factory. The scalloped edge provides a good turning grip; something best appreciated when using cold, wet fingers. The rubber seal prevents gas from sloshing and spilling, and leaking from the tank; a dangerous situation that is best avoided with one of these properly fitting fuel caps.