Cannula transfer
![Septa seal the two conical flasks. A cannula is used to transfer THF from the flask on the right to the flask on the left.](/Images/godic/202502/08/Aldolrxnpic4506.jpg")
![A rubber septum. The top folds over the neck of a flask to give an airtight seal](/Images/godic/202502/08/Rubberseptum4506.jpg")
![](/Images/godic/202502/08/Air_sensitive_cannula_-_syringe_valve4506.png")
Cannula transfer or cannulation is a subset of air-free techniques used with a Schlenk line, in transferring liquid or solution samples between reaction vessels via cannulae, avoiding atmospheric contamination. While the syringes are not the same as cannulae, the techniques remain relevant.