Or, once connected to the line, the neck can be placed under a positive pressure of inert gas and the plug valve can be fully removed. This allows direct access to the flask through a narrow glass tube now protected by a curtain of inert gas. The solvent can then be transferred through cannula to another flask.
This describes a procedure for transferring a solvent from one flask to another using a cannula after connecting the line, exposing the neck of the flask to positive pressure from inert gas, removing the plug valve, and accessing the flask through a narrow glass tube shielded by an inert gas curtain.