21-GALLON NO-RUST POLYETHYLENE GAS TANK FOR JEEP® Almost 1/4" thick walls reduce condensation, resist punctures and prevent cracking...even at -130° F! High-density one-piece polyethylene tank has no seams or welds to leak or split Replaces OE 15-gallon tank but is 5" taller-no modifications required No more rust or interior scale buildup to clog fuel system! Lighter in weight and easier to install than a steel tank. Includes extension kit to allow retention of factory skid plate. Also includes new sending unit designed to work with this 21-gallon tank. Includes top strap, new lock ring, gasket and hardware. Limited 5-year warranty.