Heavy duty aftertreatment emission components reduce harmful gases created by diesel engines, meeting today's tough emissions regulations. Without these heavy duty parts, contamination from heavy duty trucks can pose a larger threat to the environment. FleetPride has an extensive inventory of heavy duty emissions control parts to choose from. Whether you need diesel particulate filters, diesel oxidation catalysts, diesel exhaust fluid, exhaust manifolds, EGR coolers, EGR valves or sensors, we have the right part for your heavy duty needs. View our diverse inventory today to find what you need. OTR provides the highest quality heavy duty truck and trailer parts. With comprehensive research, independent testing, and continued product development, OTR heavy duty parts are sure to keep you and your truck safe while on and off the road. OTR has a wide selection of heavy duty truck parts, such as brakes and wheel end, steering and suspension, lubricants and filtration, lighting, power take off parts, batteries, starters, and more. OTR knows what it takes to repair and maintain Class 6-8 trucks, so they deliver solutions that make your job easier and more efficient. OTR warranties are comparable or better than OE and top brands. All heavy duty truck parts offer the same form, function, and fit as the OE replacement parts.