Aijiren Vials at Thomas Scientific. , and autosamplers Screw top 4 mL glass vials are a custom fit to the Aijiren autosampler tray for use as sample as well as wash vials. Vials with fill marks are also appropriate for use as wash vials and waste vials in and autosamplers. 2 ml Screw Top Vials & Caps | Aijiren