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DuraWRX Aftertreatment Products: Reliable Replacements for Demanding Diesel Applications When a diesel aftertreatment component fails, the consequences go far beyond a fault code on the dashboard. A malfunctioning DEF header or aftertreatment system component can put a truck, piece of equipment, or entire operation out of service, leading to costly downtime, missed schedules, and reduced productivity. For fleet managers, technicians, and owner-operators, choosing the right replacement part is c …