Vials, caps and septa are specially designed and manufactured to provide optimum performance and superior chemical inertness in every application. Complete line of GC autosampler vials - HPLC with ND9 screw caps and ND11 crimp, 4ml vials with ND13 screw caps, Headspace vials with ND18 magnetic screw caps and ND20 crimp, 40 EPA Purge & Trap vials ml with screw cap and silicone / PTFE septum ND24.