DeatschWerks plugs are specifically designed for fuel system plumbing. They're constructed from heat-treated 6061 aluminum, and then anodized to resist corrosion. The plugs feature a low-profile internal Allen/hex and each fitting includes an O-ring. Plumbing a fuel system is no place to cut corners, but you shouldn't have to pay a premium price for peace of mind. DeatschWerks plugs provide the optimum combination of strength, light weight, and fuel compatibility—backed by a lifetime warranty. Order the sizes needed for your applications.