It uses a GENUINE Motion Pro nitrogen needle (08-0075). You simply add nitrogen as needed to get the pressure you want from your nitrogen tank.
SHOCK NITROGEN FILL TOOL W/ NO LOSS AIR CHUCK NITROGEN GAUGE RACE SHOCKS $free$$
NITROGEN FILL ADAPTER W/ MOTION PRO NITROGEN NEEDLE 08-0075 FOR FOX Shocks RzR
Nitrogen shock regulator fill tool W/ No Loss CHUCK And Bleeder Schrader Shocks
Shock Nitrogen Gauge Needle Fill Tool W/ MOTION PRO NEEDLE 08-0075 Fox RZR +
200 psi Shock Nitrogen Fill Tool For Polaris Shocks W/ Instructions Free Needle
Shock Nitrogen Fill Tool For Polaris Rzr Shocks W/ Instructions Free Needle