NEW FORD 40 GALLON DIESEL PLASTIC GAS TANK F250 F350 F450 F550 SUPER DUTY TRUCK Made of Almost 1/4" thick cross linking seamless polyethylene tank material Wiggleys fuel tanks meet or exceed the performance of the original equipment fuel tanks they replace Lock ring included with tank (where applicable) All units are 100 percent leak tested (twice) after full product assembly 12-Month/Unlimited Mile Warranty