Like most of the other glassware in our catalog, this part is made from Schott Duran® glass or its equivalent. The joint has two reinforcing rings and the tubing is approximately the same diameter as the top reinforcing ring, affording no hold-up below the joint.
The matching inner joint is also available as are the corresponding joints in the more common medium length. For a discussion of standard taper joint sizing, see the Joints entry in the Glassware Gallery.
For plastic Keck™-style joint clips see item # 24000.