here you go lots of info
it says n2 (air) or co2, co2 is hp so you can run anything on it the same as a shocker. The vert reg just drops the pressure to the recomened psi.
i ran co2 through my 03 shocker just cos it said you could (and to see if it worked) only prob was inconsistant fps oh and the vert reg has a tendancy to freeze up!!!! (whole reg was white and frosty after ripping on the trigger)