Vials, 20mL Headspace vial only, Crimp Cap Style, 75,5 x 22.5mm 20mL crimp style headspace vials for the HS-10, HS-20, AOC-5000, and AOC-6000. Vials, GC, 20mm Magnetic Crimp Cap, Gold, 8mm Center Hole, Butyl, 100/pk. Gc Headspace Vial at Thomas Scientific Turbomatrix Headspace Starter Kit.