Need to keep your reaction under an inert atmosphere? Or maybe you have a Schlenk apparatus? Then these bubblers should prove a very useful tool.
Types 1 and 2 can be used with a reaction that needs an inerting blanket. A small amount of oil (silicone or mineral) is placed in the bubbler which allows a gentle flow of outgassing to be observed without any pressure issues to the apparatus.
Types 3 & 4 are for monitoring and isolating gas flow through apparatus, such as a Schlenk line.”