The output pressure is predetermined by adjustment to the air regulator setting.
Output pressure is maintained constantly and pump compensates for pressure drops or losses.
Hydraulic input is gravity fed, however, if pump is used alone, the feed can be pressurized to the limit of the pump. Within the pump the large diameter air piston drives a smaller piston to provide fluid flow at high pressure.
Air consumption will be approximately 56 CFM of free air at 100 psi input.
Reservoir = 4 gallon capacity, do not pressurize.