Used SGI Bio Reactor Type SET20CI. Approximately 12" diameter X 12" straight side. Approximately 20 liters / 6 gallons. T316 Stainless steel contacts. Polished. Internal rated 300 Kpa (45 Psi) @ 130 degrees C. Jacket rated 400 Kpa (60 psi) @ 130 degrees C. Serial number 5942. NB 4737. It has (11) 1" openings on top; (3) 1" & (1) 1/2" opening on side & it looks to be about a 1" opening on bottom. The overall dimensions 24" w x 30" deep x 54" high.