Ensuring you are Ready for the Road Ahead , the Fuel Tank Accessories Locking Fuel Cap safeguards your diesel’s fuel tank with the anti-theft fuel tank cap that features a safety crossbar and chain. To confirm this fuel cap is the right fit for your Kenworth truck, always determine the inside diameter of the fuel cap. Gain a peace of mind knowing your truck's diesel fuel remains secure with this heavy duty fuel cap. FleetPride is your First Click in Heavy Duty .