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The Claisen adapter can be placed on top of a round bottom flask to convert one opening into three, For example, attach one upper joint of the Claisen adapter to a condenser , one to an additional funnel, the other one to a thermometer adapter Laboy Glass Claisen adapter is made of high-quality borosilicate glass and annealed at 800 degree Celsius , can be heated directly in an open flame and can withstand typical laboratory thermal variations in Chemistry processes like heating and cooling. This Claisen adapter has three 14/20 upper outer joints to attach any apparatus with 14/20 inner joints, and a 14/20 lower inner joint to entry into a boiling flask with 14/20 outer joint.