Liberty Boiler and Mechanical Services vertical mild steel retort, serial number 36879, CRN number R-3533.2, AQP 1036, 50 PSI at 350 degrees Fahrenheit maximum working pressure, -20 degrees Fahrenheit at 50 PSI minimum allowable working temperature, bottom mounted steam sparge, top mounted bolt locking and counter balanced lid, 36" diameter x 36" total basket depth, 32" diameter x 31" deep basket, mild steel construction.