Screw Top Autosampler Vial With Cap Protect Liquids-Aijiren 2ml Sample Vials The 2ml Autosampler Vial has three types: crimp top, screw top and snap top. It is used on the autosampler, and the closures are all produced by Aijiren’s exclusive process, which can be applied to Aijiren, Thermo Fisher, Shimadzu and other famous Branded