20ml crimp top headspace vial mainly used in gas chromatography analysis, which suitable for CTC, Perkin Elmer and Aijiren autosamplers. Aijiren 20ml crimp top headspace vial is in stock, so you need urgently, you can contact the business manager, right now. 20mm Crimp Caps and Silicone/PTFE septa are equipped to those vial.