Losing your supply of gas is the least of your worries if your vehicle doesn't have a gas cap installed. You'll have to worry about the vapors coming out of the fuel tank which can ignite at any time should a fire start up near it. Not only that, an open fuel tank can produce vapors that contain hydrocarbons which can ruin the air you breathe and damage the ozone layer. Because the gas cap is capable of preventing all these from happening, it's important to have one installed that's durable. That's the reason why each one is made from high-quality materials to prevent quick deterioration. The cap also comes in two types giving you more options to choose from. There's one that can be locked using a key and another one that can be twisted in place. Aside from these features, the cap is constructed to come in a direct-fit design. This ensures that it will fit perfectly once used to cover your fuel tank. The design also keeps you from wasting time in making unnecessary modifications to its structure. So if you want to avoid experiencing the problems mention above, don't hesitate to invest in a quality gas cap. By having one in place, your fuel supply stays intact and you won't have to worry about starting a fire or ruining the environment whenever you're driving.