Designed for minimal maintenance, direct-drive Series has Sigma Profile airend, Sigma Control, and one-to-one direct-drive technology. Oversized airend connects directly to motor via maintenance-free coupling for zero-loss transmission efficiency. Cooling air flow design minimizes noise levels, and series is fitted with separator system for minimal oil carryover. Models are available with ratings from 25–450 hp, flows from 72–2003 cfm, and pressures to 217 psi.