Product Details: Keeping you Ready for the Road Ahead™, the Fuel Tank Accessories Locking Fuel Cap defends your diesel’s fuel tank with the anti-theft fuel tank cap that features a safety crossbar and chain. To make certain this fuel cap is the right fit for your truck, always measure the inside diameter of the fuel cap. Rest with confidence your diesel fuel remains secure with this heavy duty fuel cap. <br/><br/>FleetPride is your First Click in Heavy Duty®.