In addition to the Monster Valves and Mini Monsters, we’ve added a 2012 Powertank Comp System to our Powertank arsenal. This second system brings more flexibility when planning CO2 refills, and it means we can hit the trail with CO2 to spare and share. The new system features an upgrade to Powertank’s XP 400 Pro Series regulators, which work with either CO2 or nitrogen. The XP 400 regulators are liquid-filled for optimum shock and vibration resistance. Our original Powertank cylinder, on the left, is in good company.