网页20mm Headspace Vials and Closures, Convenience Kit, Crimp Vial, Beveled Edge, Al Crimp Cap. Catalog number: 20-CVCBT3-CP. Technical Support Customer Service. Save time during sample preparation and reduce the risk of contamination using Thermo Scientific™ 20mm Crimp Top Clear Headspace Vial Convenience Kits (Unassembled).