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The pressure equalizing funnel is a special type of dropping funnel.
A pressure equalizing funnel is used to add exact amounts of liquid to the receiving flask slowly and smoothly. With the side narrow-bore tube, the liquid from the funnel drops smooth without having to remove the glass joint stopper.
In a reflux reaction, the funnel will be attached to one neck of the receiving flask, while the reflux condenser will be placed on the other neck. It is also ideal to handle air-sensitive reagents in a sealed,inert-gas environment.