... :boro 3.3 (2)2mm PTFE stopcock (3)ISO 9001 Lab glassware reaction flask with angled PTFE stopcock(1)Item:Flask ... , 100/14, 50/19, 100/19, 250/19, 100/24, 250/24, 500/24(4)We have a great variety of reaction flasks ... neck(include bevel), and so on.(5)ISO 9001 certification Lab glassware reaction flask with angeld PTFE stopcock