It's called a Proclip., or Pro-clip .... you can find them a couple different places.
The work pretty well on a ProVari, pretty tight, nothing is gonna fall out, but seem REALLY tight on 22mm mods.
I have a couple and haven't tried to really shove them on.
I may bend one of them a little to make it looser, for the 22mm mods.
My new SmokTech E-Pipe with a 3.5ml UDCT tank filled with EpM Long Bottom Leaf.
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This is kinda awesome looking but I'm not sure. Bet you get some strange looks when you pull that out in a crowd. What a conversation starter!