sample preparation headspace gas chromatography with PTFE 2021 - 08 - 19 Vials Cap Septa for GC HPLC – 2ml Amber Sample Screw Vials. 20mL, Amber Glass, 22.5*75mm, 20mm Beveled Edge, Rounded-flat Bottome, Short Neck, Crimp Top Headspace Vial suitable for PerkinElmer, 00pcs/pk. Silver, 20mm Open Top Aluminum Crimp Cap, pre-assembled with 20*3.0mm Natural PTFE/White Silicone Septa. 00pcs/pk.