Get your semi truck Ready for the Road Ahead™ with secure and leak-free fuel, with the Fuel Tank Accessories 3.37" Aluminum Fuel Cap. This replacement fuel cap works to lock fluids in a tank, while resisting torque or other forces that cause similar components to loosen. Engineered with an operator-friendly body to enhance the ease of constant on / off twisting. FleetPride is your First Click in Heavy Duty®.