Mar. High quality screw neck vials with caps for hplc sampling. 4ml Screw Neck Autosampler Vial Supplier–Aijiren Vials Aijiren uses high-quality materials to make Vials, Caps & Septa, reducing the impact of vial on the experimental results. Autosampler vials 10-425 wide screw vial 13-425 screw sample vial 8-425 screw vial ND11mm crimp vial