The Cummins ISM Diesel Oxidation Catalyst is designed for new OEM numbers 4969668NX and 5287516NX. It features a silicon carbide substrate material and stainless steel canister material, and includes 1 diesel oxidation catalyst, 2 gaskets, and 2 clamps. This product is not CARB compliant and not for sale in California, but fits most Cummins ISM models. With OEM and aftermarket numbers 4969668NX, 5287516NX, C0072-ID, and C072-ID, this catalyst offers practical and efficient emissions control for diesel engines.