Unused 60" top head for De Dietrich 500 gallon reactor. National Board #3935. 75/full vacuum PSIG at 500°F. Manufacturer #33225. Built 1986. 3008 glass. U-stamped 17½" manway opening. 5½" agitator nozzle. (6) 4" nozzles. (1) 8" nozzle. Unused.
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