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.