Used Single-walled 12,000 Gallon tank, 304 stainless steel. Tank measures 10'2" diameter X 20' straight side. Unit has flat slight cone top and cone bottom with skirt. Two (2) stiffening rings. Includes 2" center top inlet, (5) additional 2" openings, (1) 4" vent, 24" manway with bolted cover including 6" & 4.5" openings. Side openings include 1" near top, 1" half-way down, 3.5" side bottom. Bottom head includes 3.5" center bottom outlet with stainless steel elbow extending to side of tank. Two (2) stiffening rings. (Qty - 2 available)