wide opening headspace gas chromatography with flat bottom Headspace vial, screw top, rounded bottom (vial only) volume 20 mL, clear glass vial, thread for 8, O.D. × H 22.5 mm × 75.5 mm, pkg of 00 ea; find Supelco-SU860097 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich