Round-bottom flasks with [ST] outer joint center neck and Ace-Thred side port

The outer joint is tooled with reinforcement rings (full-sized joints only) for added strength and stability. The internally threaded side port can accommodate thermometers or bleed tubes. Available in heavy or standard wall. Heavy wall flasks feature walls that are approximately 30% heavier than standard flasks. Ace-Thred side port size (below) also refers to the outside diameter of tubing or thermometer that will fit this joint. Fabricated from borosilicate glass.