The 11.83 Inch Cummins ISC And ISL Diesel Oxidation Catalysts With 11.74 Inch Diameter are designed for high durability and effectiveness, reducing backpressure and fuel consumption. Manufactured according to OE technology, these catalysts are made to match OE performance and fit most Cummins ISC and ISL models. With a stainless steel construction and exhaust emission norm of EPA10, these catalysts come with clamps and gaskets included for easy installation. Direct OE replacement numbers 2880589RX, 2880589, and 2880589NX ensure a practical and environmentally friendly solution for diesel emissions control.