Used approximately 30,000 gallon vertical carbon steel storage tank. 144" diameter X 419" high straight side. Flat bottom with slight cone top. Fittings: Top: 16" manway, (1) 2" vent, (1) 3" vent, and (1) 2 1/2" fill. (1) 16" side bottom manway, (1) 10' side bottom flange and (1) 1" side bottom outlet. Tank is UL listed for aboveground ground flammable storage.