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This bubbler has an integral valve to control the flow of inert gas into the system. The bubbler requires a minimal amount of oil because the inner tube is within 5 mm of the bottom. Both sidearms are 9 mm O.D. glass tubing for use with 3/8 in Cajon™ fittings (or heavy-wall vacuum tubing). The overall height is approximately 220 mm. Replacement plugs are item # CG-961-01.