Certified 2ml Screw HPLC Vials with Cap and Septa for Sale. The 2ml Screw HPLC Vials for autosamplers are made up of type 33 and type 51 COE borosilicate glass with low metal content to protect samples from destabilization or leaching.By choosing a cap and a septum, we provide the best containment solution for the sample. Get Price Details.