Dinex Selective Catalytic Reduction (SCR) catalysts are engineered for EPA 1-21 aftertreatment systems on Class 6-8 trucks and buses. The SCR is where nitrogen oxides (NOx) react with DEF (Diesel Exhaust Fluid) and are converted into harmless nitrogen and water vapor—making it one of the most critical components in any modern emission control system. Unfavorable operating conditions, poor DEF quality, or inadequate maintenance of the DEF dosing system can damage the SCR substrate over time, leading to the need for replacement. Dinex SCR catalysts provide a reliable, cost-effective solution backed by OEM-level engineering. Every Dinex SCR features industry-standard metallic or ceramic substrates engineered for peak performance and tailored to your specific vehicle application. Our catalytic engineers continuously refine catalyst properties to deliver optimal NOx conversion efficiency at real-world exhaust temperatures. All SCRs ship complete with the clamps and gaskets required for proper installation. Available for all major truck and bus platforms—including Cummins, Freightliner, Peterbilt, Kenworth, Volvo, Mack, and International—covering EPA 1, 17, and 21 systems. Backed by a standard 3-year warranty and the support of Dinex emission experts, our SCRs help keep your fleet compliant, efficient, and back on the road with minimal downtime.

• Industry-standard SCR catalyst substrate
• reduces NOx via DEF reaction
• metallic or ceramic core options
• clamps & gaskets included
• EPA 1-21 compliant
• 3-yr warranty
• all major truck & bus platforms