Made of glass specially designed for the use in Laboratories . Available in One Bulb,Two Bulb and Three Bulb forms with outer diameter 17 mm and Bulb diameter 40 mm as shown in the table.

Distilling Tube Length Outer Dia Bulb Dia code
One Bulb 250mm 17mm 40 mm 21760
Two Bulb 300 mm 17mm 40 mm 21761
Three Bulb 300 mm 17mm 40 mm 21762