20ml flat bottom headspace gas chromatography with PTFE septa online 2022 - 10 - 24 CHROM4_Catalogue-2019_Web2.pdfWide mouth vials (VT010M-1232) and caps w/PTFE septa 20mL Clear Headspace Glass Crimp Vial, 23 x 75mm, Rounded Bottom Lowest bleed of any septa.