What is this thing?

I'm going to convert my computer chair from pneumatic to static. I'm currently using plastic clasps that are held on with jubilee clips, but they're not great and need replaced (I'm a heavy lad). A sturdy metal version would be better.

I'm assuming the plumbing world would have something like this, but the language of the plumber is arcane and inaccessible to regular goombas like me. What do I type into the search box?

Cheers!