Used approximately 400 gallon vertical 316 stainless steel tank. 36" diameter X 72" high straight side. Flat bolted top, flat welded bottom. Top fittings: 9" X 23" manway, (2) 2", (1) 2 1/4", and (1) 1". 3" top side flange and 3" bottom side flange. 1" off center bottom outlet.