Tube cap

I have bought a "Bonding Steel" (or 2K putty to repair metal parts).
As I got the package I found that there was no cap for the 2 hardener tubes.
So I had to use a complete tube at once- or print a cap :)

I have no Idea about the standard of the thread (DIN, ISO, EN ...?) , but I measured the dimensions with a vernier caliper and created the cap- it fits.