The factory tank is plastic with a 1/8-inch-thick steel skidplate. The GenRight tank is 1/8-inch-thick aircraft-grade aluminum with a 3/16-inch-thick steel skidplate. The larger capacity GenRight tank also gives 1/4-inch more ground clearance. Note that the fuel pump/sending unit flange is above the flange on the tank. That’s normal for TJs. The TJ sending unit is spring-loaded to make sure the pickup stays on the bottom so when you release the retaining ring they pop up.