In all honesty, if your not using it on a Squonker, I'd recommend running the Velocity with a Vulcan style heatsink fin adapter. Thing gets damn hot anyway and an added bonus is the heat Fin adapter will protect keep your Stainless threads on your RX or Velocity from getting mucked up with repeated installs/unistalls.
Or else this thing looks cool:
Authentic Connect-it Vape 22mm Quick Connect