I recently brought a lp tank from warped paintball, the guy told me its a lp tank for my angel. its not that i dont believe them but can i tell its a lp tank?
as it looks no different from my hp tank, here are a couple of picture.
Look on the reg next to the pressure guage. My Totemair reg has "low pressure 450psi" written on it. Warped are good reliable lads and I don't doubt that they'll have sorted you out with a LP if that's what you asked for.