The 11.95 Inch Cummins ISM Diesel Oxidation Catalysts with 13.24 Inch Diameter are a high-quality solution for reducing exhaust emissions. With a stainless steel construction and manufactured according to OE technology, these catalysts offer high durability and effectiveness. They are designed to fit most Cummins ISM makes and models, making them a practical choice for a wide range of vehicles. The catalysts come with clamps and gaskets included, ensuring easy installation. With reduced backpressure and fuel consumption, these catalysts provide a direct OE replacement, offering the same performance as the original equipment. Compatible with various OE replacement numbers, including 4969668NX, 5287516NX, 4969668, 5287516, 4969668RX, 5287516RX, and OTR0152063.