Closure & Septa for 8-425 (8mm) Screw HPLC Vials for Sale. These septa are designed to work on most HPLC screw vials. Screw HPLC Vials offer the convenience of screw thread vials for vials that were originally designed for screw-top vials. They are available in both clear and amber glass. Rated 4.8 /5 based on 500 customer reviews.