The Cummins ISX Diesel Oxidation Catalyst is a high-quality product designed for OEM Numbers 4965225NX. It features a durable silicon carbide substrate material and a stainless steel canister material, ensuring long-lasting performance. This catalyst is sold individually and is not available for sale in California due to non-compliance with CARB regulations. It is compatible with most Cummins ISX models and can be used as both an OEM and aftermarket replacement. With its reliable construction and compatibility, this catalyst offers practicality and efficiency for diesel engines.