20ml amber headspace glass vials for sale for GC Sigma Headspace vial, screw top, rounded bottom (vial only) volume 20 mL, amber glass vial, thread for 18, O.D. × H 22.5 mm × 75.5 mm, pkg of 100 ea; find Supelco-SU860098 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich