Outfit your semi truck to be Ready for the Road Ahead with secure and leak-free fuel, with the Velvac 3" Non-Locking Aluminum Fuel Cap. With a 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. Manufactured with an ergonomic body to enhance the ease of constant on / off twisting. FleetPride is your First Click in Heavy Duty .