This is an aftermarket DOC unit by Skyline Emissions Inc., for Cummins ISXengines. This Diesel Oxidation Catalyst (DOC) is a direct replacement for OEMpart numbers: 2888263, 2888263NX.The gasket part number that is used with this DOC is SG-FB-13.2-C-A1-K1,recommended quantity: 2The clamp part number that is used with this DOC is SC-F13.2-4C1-A1-K1,recommended quantity: 2Note:Not shippable to California Diesel Oxidation Catalyst (DOC) for Cummins ISX engines Direct replacement for OEM part number OEM equivalent diesel emission control performance Exact-fit design for easy installation Manufactured with new materials, not reconditioned High quality stainless steel for durability and corrosion resistance Designed and made in the USA Backed by 2 year, unlimited mileage warranty Includes Gaskets and Clamps OEM Part Number: 2888263 2888263NX Gasket Part Number: SG-FB-13.2-C-A1-K1 Recommended quantity: 2 Clamp Part Number: SC-F13.2-4C1-A1-K1 Recommended quantity: 2