Interchangeable with penny head stoppers. Use with boiling and distilling standard tapered flasks
These lightweight, hollow, borosilicate glass stopper have a flat hex head for easy gripping
• Includes extracting nut for safe removal from flasks with ground joints
• Chemical resistant and autoclavable at 121°C (250°F)
Joint Size: 29/42
Thread Size: 29
U/M: each
$31.50 Each