Ensure sample security and integrity with inert vials that have the highest recovery rates, an ultra-low pH shift, and lowest alkali content. Fisherbrand™ Shell Vial Kit, Clear Glass, PE Plug. Recommended for HPLC usage. Fisherbrand™ 13mm Vial Kit, 13-425 screw thread, Clear Glass, 4mL, PP Screw Cap, PTFE septum.