Home » News » HPLC Septa Cap » Sigma autosampler vial septa closure for chromatography vials Analytical Chromatography - Sigma-Aldrich We offer a wide selection of autosampler and general-purpose vials, including septa, caps, accessories, amber and clear bottles, headspace vials, polypropylene and TPX vials, center drain vials, and silane-treated vials for special applications.