Round-bottom flasks with three [ST] outer joints and #7 Ace-Thred neck

The outer joints are tooled with reinforcement rings for added strength and stability. Necks are vertical unless noted otherwise. Two of the side necks are in-line with the center neck. The third side neck is placed in front of the center neck and is internally threaded to accommodate thermometers or bleed tubes up to 7mmO.D. Heavy wall flasks feature walls that are approximately 30% heavier than standard flasks. Supplied with #7 nylon bushing and FETFE O-ring.