VWR® Crimp Caps for 20 mm Clear Crimp Seal Headspace Vials Supplier: VWR International Description: VWR Crimp Cap, 20mm with 9.5Mm Hole, Thickness: 3 mm, Cap color: Silver, Cap material: Aluminium, Septa type: Clear PTFE/Gray Butyl Rubber, to fit most headspace autosamplers Certificates Headspace Crimp Vials, 20 mm, Restek Supplier: Restek