Jacket length is measured from the lower shoulder of the bulb to the bottom of the finger. Diameter of tube is 14 mm. Used in 12845 & 12846 pilot plant reactors. Use with #15 Ace-Thred bushing and 8042 glass adapter to fit top 45/50 joint in 5945-76 condenser. Use with 5/16-inch or 3/8-inch I.D. tubing, size C hose connections.