Gas GC Headspace Vials-headspace vial supplier Headspace (HS) coupled with gas chromatography (GC) provides quantitative and An alternative headspace vial septum was investigated, to. 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.