Available with several column I.D.s and lengths to fit diverse applications. Supplied with a Teflon® stopcock for control, and a drip tip. Stopcock bore is 2 mm for columns with I.D.s through 25 mm, 3 mm for columns with 29.5 mm I.D., and 4 mm for columns with I.D.s of 41 mm. Length is column height.