The OTR Diesel Oxidation Catalyst, with Expertise Built In™, as the perfect choice for contemporary engine catalyst needs. This high-grade DOC is made from stainless steel for superior longevity and corrosion resistance. The matting is of the highest quality, being held in place with steel retention rings. To ensure performance above OEM standards, ongoing testing is conducted. Installation is made easy with this OTR Oxidation Catalyst. OTR knows what it takes to repair and maintain Class 6-8 trucks, so they deliver solutions, making your job easier and more efficient. OTR warranties are comparable to or better than OE and top brands. All heavy duty truck replacement parts offer the same form, function, and fit as the OE replacement parts. FleetPride is your First Click in Heavy Duty®.