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DEF Header Solutions Built for Bus Fleet Reliability Thomas Built®, Freightliner®, IC®/International®, and Blue Bird® When DEF system downtime keeps your buses off the road and maintenance costs climbing, it’s time to rethink your DEF header and sensor solution. DuraWRX™ DEF headers are engineered to restore confidence in your emissions system—delivering durability, accuracy, and long‑term uptime across today’s most common school and transit bus plat …