GC Headspace Vials, EPA Sample Storage Vials, COD Tubes 2021 - 11 - 04 Our major products are high performance liquid chromatography & gas chromatography consumables such as Chromatography Autosampler Vials with closures, HPLC vial, GC vial, micro-inserts, micro-vial, Reagent bottle, and syringe filters, etc; Water analysis consumables such as COD test tube, EPA vial, TOC vial.