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A gas bubbler is a piece of laboratory glassware used in Schlenk lines and other setups where a positive gas pressure is used/produced. Often, it is used to visually determine/regulate the amount of inert gas flowing through a system.
The gas bubbler consists of a glass bulb filled with a small amount of fluid - usually glycerol, mineral oil or silicone oil. Such devices are also called oil bubblers. Mercury was used in the past. The inlet to the bulb is connected to a ground glass joint, while the outlet is vented to the air.
Gas bubblers can be bought from lab suppliers.
Similar equipment can be purchased from aquarium shops.
DIY gas bubbler
A small gas washing bottle can be used instead of a gas bubbler.