Teflon® PTFE body with Viton® O-ring for air tight vacuum work (Size 10/18 adapter does not have a body O-ring).Adapter has a threaded polypropylene screw cap on top with an inside O-ring for depth adjustment of 6-7 mm for straight stem thermometers, glass tubing and other itemsRotating the extracting nut removes the adapter from flaskNot autoclavableTEFLON® is a registered trademark of The Chemours Company FC LLC and used under license by Bel-Art Products, Inc.
