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This is the most traditional rotary evaporator bump bulb/trap and is used between the vapor tube and evaporation flask on a rotary evaporator to prevent the contents of the flask from being drawn into the condenser in the event of solvent bumping. The lower stem has 2 large holes; see CG-1321 and CG-1322 for modified/improved versions.
This item is available in 100, 250, and 500 mL volumes with your choice of upper and lower joints.