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Convert standard flasks and other apparatus to Schlenk flasks for inert atmosphere manipulations with these handy adapters. The top outer and lower inner standard taper joints are the same size. These come with your choice of a 2 mm bore glass stopcock on the sidearm (as shown) which includes a constant pressure retention device or a 0-4 mm Airfree® inlet valve with serrated hose connection. The Airfree CG-590-02 plug has a T-shaped co-linear bore with the sidearm that provides a pathway for vacuum when the knob is screwed open and forms a tight PTFE-to glass seal when it is screwed closed.