These Pyrex® three neck flasks have two angled side necks at the same height with ST outer joints and a larger center neck with a vertical ST joint. Made of sturdy borosilicate glass; reusable.
Cat.No. 1-4965-250 is also a replacement part for organic chemistry kit 1-6949, and Cat.No. 1-4965B-250 is a replacement part for organic chemistry kits 1-6949E and 1-6949G-2.