Wellhead compression applications require reliability and durability not found in every natural gas engine. For dependable low emission operations and world class support, you need Cummins QSL9G - an emissions compliant, high-performance natural gas engine that shares the proven heritage of the Cummins C Series diesel engines and many of the same heavy-duty components. You can depend on the QSL9G to stay emissions compliant, keep maintenance costs down and the gas flowing. Every day.