Commercial Welding manufactures 3 basic sizes of overhead gravity flow tanks,160 gallon,300,and 550 gallon.These economic units come complete with stand,hose,nozzle,emergency valve,fill cap, and tank gauge.They have sturdy angle iron frames and are available in a wide range of colors. Our fuel oil tanks are manufactured in U.L. 80 and non U.L. styles in 135 to 400 gallon sizes.These tanks are also widely used for bulk oil storage and other applications.