NG160, NG225 and NG295 natural-gas-powered generators from Doosan Portable Power combine the ability to operate on wellhead natural gas and in harsh, rugged environments. Features include an automatic dual-fuel switch, enabling the generator to operate on natural gas as well as propane from an external tank. The Onboard Scrubber System improves machine performance by removing excess dirt and water from wellhead gas and includes a heated drain valve to prevent water removed from the gas from freezing in the hose. 800/633-5206; www.doosanportablepower.com.