Used Approx. 20,000 Gallon vertical 304L Stainless Steel Storage Tank, mfg by Industrial Air Inc., built 1986. Slight cone top, flat bottom. 12' diameter x 24' tall. API-650, Design Pressure: Atmospheric at 120 deg F. Top nozzles: (1) 4", (1) 3", (2) 2", (1) 1-1/2". Bottom Side: 24" Manway, (1) 3" outlet, (1) 14", (1) 3", (1) 1-1/2". Weight - Approx. 16,000 #. Previous use: 50% Caustic.