Standard Opening 2ml HPLC Vial with Cap for Autosampler from Aijiren. These 2ml HPLC Vials with Caps are 40% large and are designed for use in robot autosamplers, known as Aijiren. So welcome your inquiry about 2ml HPLC Vials with Caps and other chromatography vials from Aijiren. Rated 4.6 /5 based on 307 customer reviews.