Safe-Lab® Hollow PTFE Stoppers
By Bel Art Products
Use these hollow PTFE plastic stoppers for boiling and distilling flasks with ground joints. They are easily removed from standard tapered glassware by turning the red extraction nut to apply a safe, gentle and even force against the mouth of the vessel. Stoppers help eliminate accidents and breakage and are autoclave safe at 121°C (250°F).