Headspace Vials, ND20, 20 mL, 23×75 mm, Standard Neck, Round Vials for gas chromatography (headspace vials) are available in different sizes and come with crimp or screw finish. Headspace vials have to withstand high Headspace crimp vials, ND20 – VWR International Clear and amber glass vials with a rounded or flat bottom, and volumes from 5 to