Hollow Teflon® PTFE stoppers are designed for boiling and distilling flasks with ground joints.

• PTFE plastic construction
• Red extraction nut allows safe removal of stoppers
• Stoppers designed for boiling and distilling flasks
• Autoclavable

Safe-Lab™ stoppers 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, helping to eliminate accidents and breakage. Autoclave safe at 121°C (250°F).