As title, 1.1 pure energy bottle and reg, I believe it is a hp reg but not 100%, has been used on DM's and Ego's. Pi stamped.
Born 08/2006 so 2 and a half years test left.
Comes with Hybrid bottle cover.
In 99% of cases, that's true as the LP regs are blue, and HP regs red.
But the reg internals are interchangeable, so it is possible for it to have been changed, but usually highly unlikely.