Description_x000D_ General description_x000D_ These NMR tubes feature a glass/PTFE pressure valve permanently joined to a choice of available sample tubes. These pressure tubes facilitate experiments requiring conditions such as pressurized inert atmosphere blanketing, addition of reactive gaseous reagents under pressure, containment of low boiling point solvents or samples at elevated temperatures._x000D_ Legal Information_x000D_ Norell is a registered trademark of Norell, Inc.