Used 20000 gallon 316L Stainless Steel tank. Manufactured by Letco. 12'6' diameter x 23' straight side, dish top, flat bottom, (3) turns internal coil rated 150 PSI at 150 F, 20" top manway, 3/16" top and shell thickness, 1/4" bottom thickness, 6" sump discharge. Serial# 2457. National Board# 673. Built 1990.