Gas Chromatography Vial found in: Minum-Ware® Gas Collection, Butyl Gray Headspace Vial Septa, Mininert Precision Sampling Valves for Vials, Micro-Vials.. MW-72 G.C. collection tubes are sold 12/Pkg. Vials are supplied complete with Viton o-ring (MW-100-01), PTFE faced septa (MW-104-11) and open-top screw cap (MW-102-11). Chat Now.