Headspace Vials found in: Screw Thread Headspace Vials, Headspace Vials, Crimp Top, Autosampler Headspace Vials, Headspace Vials, 20 ml Headspace Vial,.. Clear glass vials with 20mm crimp seal finish are designed to fit most headspace autosamplers Flat bottom vials maximize heating efficiency when used with bottom Round bottom vials are more easily handled by robotic arms that lift the vial