Perfect for boiling and distilling flasks, this Safe-Lab™ solid Teflon® PTFE plastic stopper with threaded polypropylene extracting nut is designed for use with flasks with ground joints.

• PTFE plastic stopper construction
• Polypropylene extracting nut easily removes stoppers
• Designed for use with tapered joints
• Autoclavable

It is easily removed 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).