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This versatile bubbler has an adjustable inner tube with a #9 Chem-Thread. The taper at bottom of reservoir allows for use of a minimal amount of oil. Some folks have used this model with mercury or other high-density fluids as a "poor man's manostat" to perform vacuum distillations at reduced pressure.
The complete bubbler consists of the lower reservoir, adjustable inner tube, compression nut and a CG-305-110 #110 Viton® O-ring. The body width is 25 mm and the maximum overall width is 75 mm. The body height without the tube installed is 180 mm. The diameter of the adjustable inlet tubing (top sidearm) and outlet (fixed) sidearm is 8mm.
For a mercury-free manostat, see the Mano-Watch™ vacuum controller/monitor, item #20900-A.