Headspace vial, beveled top, rounded bottom – Sigma-Aldrich Headspace vial, beveled top, rounded bottom volume 20 mL, clear glass vial, O.D. × H × I.D. 22.7 mm × 75 mm × 12.5 mm, pkg of 100 ea; find Supelco-508454 With Our Simplified Selection of Chromatography Vials – Restek (HS: 6, 10, 20 mL, Flat) 2.0 mL, 9 mm Short-Cap, Screw-Thread