Lab glassware reaction flask with angled PTFE stopcock (1)material:boro 3.3 (2 ... stopcock (3)ISO 9001 Lab glassware reaction flask with angled PTFE stopcock(1)Item:Flask ,reaction,with PTFE stopcock(2)Material:heat ... /19, 100/24, 250/24, 500/24(4)We have a great variety of reaction flasks, such as one neck, two ... and so on.(5)ISO 9001 certification Lab glassware reaction flask with angeld PTFE stopcock