round bottom 20ml headspace vials in clear online USA Headspace vial, beveled top, rounded bottom volume 20 mL Headspace vial, beveled top, rounded bottom volume 20 mL, beveled finish clear glass vial, O.D. × H 22.6 mm × 75 mm, pkg of 100 ea; find Supelco-27296 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich.