The upper bulb, located between the stopper and the capacity graduation is approximately one-tenth the flask rated capacity. The 2 L size upper bulb is only one-twentieth capacity. The additional bulb assists in the mixing of liquids or powders when shaken.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.