hplc vials and caps in clear for HPLC sampling supplier Various vials, including Screw-Thread, Crimp-Top, Certified, WISP, Headspace, Versa, Precleaned VOA Sampling, Accuform Micro-Vials, and Snap-Top caps. Compatible with all 9 mm screw-thread vials. Molded, 10 mil, solid, pierceable cap.