This flask has walls tapered inward toward the bottom

This type design allows continuous operation with smaller volumes. Supplied with a standard taper outer center neck, two standard taper outer angled side necks, and one #7 Ace-Thred port for thermometers, miniature electrodes, etc., up to 7mm O.D. Full sized joints (only) are tooled with reinforcement rings for added strength and stability. Fabricated from borosilicate glass.