Engineered for Emission System Reliability: The 2866636 Aftertreatment Device Inlet Gasket. This is one genuine 2866636 Aftertreatment Device Inlet Gasket, a specialized, high-temperature exhaust seal used to secure the connection between the exhaust pipe and the Aftertreatment Device (AFM) inlet, which typically houses the Diesel Oxidation Catalyst (DOC). This component is absolutely critical for the efficient and legal operation of the engine's emissions control system. The 2866636 gasket is a wire-knit, woven graphite construction designed for longevity under the harshest engine conditions, including continuous exposure to extremely hot and corrosive exhaust gases. A failure in this gasket can lead to exhaust leaks, a reduction in the necessary back pressure for DPF regeneration, engine fault codes, and significantly higher maintenance costs. It is highly recommended to replace this seal every time the aftertreatment system is separated for service or cleaning. Cross-references of the product: Cumins 2866636, Navstar 2866636, Dormn 674-9043, PACAR Q312526, PAI P132027, and Redlne G02001. The superior design of 2866636 guarantees a tight, durable seal, crucial for the efficient function of the DPF/SCR system, supporting optimal performance and fuel efficiency. Characteristics: ⦁ Part Type: Aftertreatment Device Inlet Gasket / Exhaust Flange Seal ⦁ OEM Part Number: 2866636 ⦁ Inner Diameter (ID): 3.75 inches ⦁ Outer Diameter (OD): 4.625 inches ⦁ Connection Type: 4-inch Straight Marmon Flange ⦁ Compatible Engines: Cumins ISL/ISC (EPA13+)