Aluminium headspace caps, ND20 with septa. Supplier: VWR Collection. Description: VWR®, N/A, Chromatography vial closure, Aluminium, Ø: 20 mm, Type: Clear lacquered aluminium, Hardness: 50° shore A, Septum: Butyl/PTFE grey, Thickness: 3,0 mm. ,548-0062EA,548-0063EA,548-0579EA,548-0065EA,548-0064EA,548-0592EA.