Diesel-powered mobile generators (90REOZT4 and 120REOZT4) from KOHLER Power Systems are designed to withstand the elements, run long hours in prime and standby applications, and meet all EPA emission requirements. Generators run on a John Deere Tier 4 Final 4.5L engine. Features include a heavy-duty air cleaner with restriction indicator, fuel tanks designed for 24-hour runtime, external emergency stop and stainless steel door latches and hinges. 800/544-2444; www.kohlerpower.com.