HP MAX

What is the max operating pressure? Why does it say 4500 PSI and 3600 PSI?

• The HPMax has a max operating pressure at 3600 PSI.  
• The wording on the air tank reads "max safety filling pressure is 4500 PSI", but it only applies to the tank, NOT THE AIR GUN.
• Over filling over the Max Operating pressure, will result in a Valve pin lock and loss of power.