But supplying the highest-quality, state-of-the-art GC and HPLC products directly to customers is just the beginning! Glass Crimp Caps Headspace Vials (20 mm), Autosampler vials for headspace GC applications. 20mL Clear Vial, 20mm Beveled Edge Crimp, Non Sterile, Rounded Top, Flat Bottom - 1,000/CS (100/PK, 10PK/CS) 5 star.