Outfit your semi truck to be Ready for the Road Ahead™ with secure and leak-free fuel, with the Fuel Tank Accessories 3.37" Non-Locking Aluminum Fuel Cap. Thanks to its tight-fitting design, this replacement fuel cap is able to lock fluids in a tank while resisting torque or other forces that cause similar components to loosen. Crafted with an operator-friendly body to enhance the ease of constant on / off twisting. FleetPride is your First Click in Heavy Duty®.