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Selective catalytic reduction (SCR) systems remove harmful gases from the exhaust gas to meet the requirements of emissions standards. Uses the injection of Diesel Exhaust Fluid (DEF), a urea-based liquid into the exhaust stream to convert harmful nitrous oxides to nitrogen gas and water. The SCR is combined with the diesel particulate filter (DPF) to deliver clean emissions. Perkins aftertreatment and engines are an integrated system and are specified, built and tested for optimum fuel economy, performance and to reliably meet emissions standards.