Pneumatics are powered by compressed air. Air compressors supply compressed air for powering pneumatic tools, pumps, and equipment. Compressed-air treatment products remove water, oil, and other contaminants from a compressed-air stream to keep pneumatic parts and equipment performing as expected. Pneumatic tools are lightweight but powerful. They include air guns, air grinders, air impact wrenches, air hammers, air nailers, and air riveters. Pneumatic hoses and fittings are used for connecting pneumatic systems and equipment. Replacement parts are used to repair and maintain pneumatic systems to keep them in good working order.