Headspace vials convenience kit (clear glass, bevel top, round bottom), pkg of 100 volume 20 mL, vial O.D. × H 23 mm × 75 mm, PTFE/silicone septum: 27307: Headspace vials convenience kit (clear glass, bevel top, round bottom), pkg of 100 volume 20 mL, PTFE/butyl rubber septum, vial O.D. × H 23 mm × 75 mm: 27316: Vial, Chromacol