The OTR Diesel Oxidation Catalyst for Cummins ISX engines ensures you are Ready for the Road Ahead™ with its design to ease system back pressure while decreasing emissions of hydrocarbons, carbon monoxide, soluble organic fraction, carbon monoxide, and unregulated contaminants in on-highway and vocational trucks. This diesel oxidation catalyst also plays a vital part in the diesel particulate filter’s thermal management. FleetPride is your First Click in Heavy Duty®.