Vacuum airless Vacuum Tube Schlenk Capacity (mL) 50. Approx. Stem O.D. (mm) 9. Approx. Body O.D. x Height (mm) 25 x 100. Approx. Overall Width x Height (mm) 70 x 165 Tube has a HI-VAC valve to control gas flow to the reaction tube. Suitable for use with 2