A cannula is a long thin metal tube that is used to transfer air-sensitive liquids or solutions.
Cannulas come in different bore sizes and lengths.
The ends are pointed so they can be inserted through septa. In many respects a cannula is like a very long double-ended syringe needle. Turn up the nitrogen pressure on bubbler A and turn it off on bubbler B . Insert one end of the cannula through the rubber septum on the left Schlenk flask, but DO NOT submerge it below the level of the liquid. Check to see that nitrogen is flowing out of the cannula.