The unique design of the PureAir Series assures the long life and productivity. Internal moving parts in the PureAir Oil-Less design are protected from wear without conventional lubrication. Crankshaft and rod bearings are lubricated by exclusive sealed, solid synthetic lubricants. Pistons move on alloyed heat-resistant filled Teflon guide and compression rings. The result is low maintenance, high durability and pure, oil-less air! All models are rated for 100% continuous duty cycle at 100 PSIG for single-stage units and 175 PSIG for two-stage units.