20mm VWR Aluminium Headspace crimp cap with Butyl/PTFE septum. Made in Germany.

Material:  Aluminium
Septum:  Pharma-fix Butyl/PTFE
Diameter:  20mm
Thickness:  3mm
Hardness:  47° Shore A
Cap colour:  silver
MPN:  548-0064
Pack size:  100