Common use 2ml HPLC vial insert for hplc vials VWR USA. hplc vial sample with inserts distributor. Wide Opening 2ml HPLC vial insert supplier vial sample supplier Screw 8-425 (8mm,N8) HPLC Vial,Cap,Septa and Inserts . They are made with a 5.5 mm opening. These vials are designed to work on most autosamplers that use 12mm x 32 mm crimp style vials.