Pyrex® Bell Jars with Top Knob and Ground Flange
By Corning
These Pyrex® bell jars are made from specially selected mold-blown blanks. The bottom flange has a finely ground finish to assure tight sealing with ground glass plates. The knob on top provides a convenient handle for lifting the jars. They are rated at 1-atmosphere of vacuum. Made of sturdy borosilicate glass; reusable.
Warning: do not use with heat or pressure applications.