Perhaps you've noticed, fuel nozzles are designed to drip gasoline down the side of your car and chip your paint. Unless you're "Quick Draw" McGraw, gas is going to drip on your nice waxed surface. Not a good thing. With the flap out, gasoline and diesel fuel sheet right off the FuelGuard onto the ground, not on your car. Made of soft rubber that rolls up for easy storage. Also protects against accidental hits on your paint. No adhesive, screws, tools or drilling needed.