![PTFE O-Ring](http://chemchix.com/cdn/shop/products/PTFE-O-Ring-150mm_web_{width}x.jpg?v=1623434816)
The PTFE O-Ring 150mm fits in the groove of your MPD Boiling Flask. Accompanied by the Flange Clamp 150mm – ChemChix Supply Co., you can properly attach any MPD head to a MPD flask. O-Ring and Clamp come with any MPD head.
Boiling Flask applications: