China Laboratory 18mm Screw Thread Glass Gas Chromatography 2021 - 11 - 19 Aijiren mainly supply autosampler vial, HPLC vial, GC vial, septa and caps, EPA vial, TOC vial, COD vial, liquid chromatography and Gas chromatography vial, reagent bottle with GL45/GL80 screw cap and glass stopper.