Autosampler vials & caps for HPLC, LC/MS, GC and GC/MS. There’s a Thermo Scientific vial & closure for every HPLC, GC, MS instrument, application, and budget. Screw Vials, Caps, Septa, Inserts & Kits. Crimp/Snap Vials, Caps, Septa, Inserts & Kits. No-Fail SureStop Vials & AVCS Caps.