Sigma-Aldrich Online Catalog Product List: 20 mL Headspace Vials Z292036 Headspace vial, clear glass, beveled top, flat bottom volume 20 mL, O.D. × H × I.D. 23 mm × 75 mm × 12.5 mm, for use with A.I., Dani Headspace, Dani Purge and Trap, Hewlett-Packard , PerkinElmer ®