VWR® Crimp Caps for 20 mm Clear Crimp Seal Headspace Vials Supplier: VWR International Description: VWR Crimp Cap, 20mm with 9.5Mm Hole, Thickness: 3.2 mm, Cap color: Silver, Cap material: Aluminium, Septa type: Tan PTFE/White Silicone, to fit most headspace autosamplers Certificates VWR® Screw Caps for 4 ml Screw-Thread Vials