Dec 21, 2006 · Crimp Top 20mm Clear Glass 20mL Headspace Autosampler Vials w Tisch 20mm crimp top vials have a volume of 20mL and provide an excellent seal for long term sample storage and analyses involving high volatile solvents. 20mL Crimp-Top HeadSpace Vial – Flat Bottom – Clear 22.575.5 mm Brand Name, LLES Inc. Cap Type, Crimp Cap.