Amber 2ml HPLC Vial with Cap for Sale. 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. Standard Opening 2ml HPLC Vial with Cap for Autosampler from Aijiren.