The Fuel Tank Accessories 1/4" Turn Locking Fuel Cap keeps you Ready for the Road Ahead , protecting your truck's diesel fuel tank with an anti-theft fuel tank cap that features a safety crossbar and chain. This heavy duty fuel cap replacement will fit securely with four roll pins inside the cap for attaching points. Rest assured your diesel fuel remains safe with this heavy duty locking fuel cap. FleetPride is your First Click in Heavy Duty .