DINEX Graphite Diesel Particulate Filter Exhaust Gasket for Freightliner/International 4". This DINEX exhaust gasket is engineered as a direct-fit sealing component for diesel particulate filter (DPF) and exhaust pipe connections used on Freightliner and International platforms. Constructed from graphite sealing material and manufactured to OE-replacement dimensions, the gasket provides a flat, compressible sealing surface that conforms to mating flanges and clamp assemblies. The part is offered to meet EPA10 emission system requirements and is produced in the United States to the specified 4.00" diameter and approximately 0.83" cross-sectional height. In service, the gasket solves the operational problem of exhaust leakage at the DPF-to-pipe joint. By forming a tight seal, it prevents exhaust gas bypass that can lower particulate capture efficiency, disrupt DPF regeneration cycles, and allow soot-laden gases to escape upstream of aftertreatment sensors. Proper sealing reduces the likelihood of increased backpressure variability, abnormal sensor readings, and premature forced regenerations that lead to unplanned service events. For fleet operations, the measurable value includes restoring designed aftertreatment performance after seal failure, reducing soot ingress to adjacent components, and enabling predictable regeneration behavior that helps avoid roadside downtime and unscheduled maintenance. The gasket is a one-piece graphite construction intended for replacement with OE-style clamps and flanges and carries standard aftermarket warranty coverage. When installed to recommended torque and clamp specifications, it delivers repeatable seating and sealing characteristics across thermal cycles typical of heavy-duty diesel use. This replacement gasket supports continued compliance with emission control function and helps maintain stable DPF operation in heavy-duty fleet applications.