TITAN Fuel Tanks are the best aftermarket fuel tanks that you can buy. The bodies of all TITAN Tanks are made of XLHDPE, which is one of those space-age materials which performs amazing feats, such as superior performance in any weather, in extreme hot or cold temperatures. With its seamless design, the TITAN Fuel Tank is one piece - and very tough.On the battlefield performance isn't a luxury, it's a necessity. That's why the U.S. Department of Defense uses the same processes and materials as TITAN for fuel tanks in some of the U.S. Military's combat vehicles. Yes...it's that good.