Forney's new Fornair air compressors are ideal for plasma cutting, nailers and staplers, blow guns, grease guns, and inflation. These compressors were built to last with a steel tank for durability and lower RPM output for longer motor and pump life. They were designed for high efficiency with optimal PSI to operate pneumatic tools and a built-in moisture separator to deliver clean, dry air. These user-friendly machines have an oil-free pump that provides maintenance-free operation and large gauges for easy monitoring of tank and line pressure. Both of these air compressors are 4 gallons. ITEM# 555 offers 4.5 CFM @ 90 PSI and ITEM# 550 offers 2.5 CFM @ 90 PSI.