A 1700-rpm piston driven, 1/8 horsepower motor provides 25 to 32 psi. Of consistent pressure for up to three hours of continuous operation. No messy lubrication with this compressor. It comes with a heavy-duty air hose that fits alll sparmax airbrushes and is also compatible with iwata and other popular japanese airbrushes. A 1/4"" adaptor is included for american and european hoses. Includes a moisture separator (with air bleed) and a thermal safety switch to prevent accidental overheating. This compressor runs continuously when switched on. When the airbrush is not being operated, air bleeds off at the filter base.