Yep. Although you could pretty easily come up with a substitute. Perhaps a loop bungee with a boltsnap on the end? There is about 1/2 inch of regulator that sticks out past the lp port. You might be able to get a loop to engage around that and the spg. I haven't bothered solving that yet as I've only had the vavleulator for a couple months.@kelemvor Piranha sells adapters that allow you to fill from a fill station.
downside to those on a pony is if you sling it, you don't have a valve knob to snap a loop bungee over so it rides much more streamlined
Thanks for the tip on the adapter!