Keyword: '20ML CLEAR ROUNDED BOTTOM HEADSPACE VIAL'. Headspace vials convenience kit (clear glass, bevel top, round bottom), pkg of 100. Headspace vials convenience kit (clear glass, bevel top, round bottom), pkg of 100. Product Number. Product Description. SDS. 27303-U. volume 10 mL, vial O.D. × H × I.D. 23 mm × 46 mm × 12.5 mm, PTFE/silicone.