Gas scrubber 5000 mL flask with a 60 mm Duran® o-ring flange center neck and side port, (2) 45/50 side necks and two 0-10 mm valves. One valve is positioned 30 degrees from dead center bottom and is the process valve to the liquid pump. The other valve at dead center bottom is a drain valve for emptying the vessel without disconnecting the process valve.