When your fleet consists of emergency response vehicles that need to be ready at a moment’s notice, emissions systems aren’t just regulatory—they’re operational. The DEF (Diesel Exhaust Fluid) head unit is a critical component of the AFTER-TREATMENT chain, and for REV Fire Group units equipped with the Cummins ISL engine, the correct replacement built to OEM 724525 specifications ensures your SCR (Selective Catalytic Reduction) system remains accurate, reliable, and ready.
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Continually monitors DEF fluid level, temperature and urea concentration, feeding precise data to the engine control module
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Regulates the dosing of DEF into the exhaust stream so the SCR catalyst can effectively reduce NOx emissions
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Designed to match OEM 724525 calibration, allowing plug-and-play compatibility in REV Fire Group Cummins ISL rigs
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Helps prevent errors such as emissions fault codes, warning lights and engine derates triggered by inaccurate sensor feedback
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Built for the tough conditions of emergency vehicles—frequent starts, extended idling, high ambient temperatures and vibration
Putting the wrong part—or skipping this component entirely—can cost you more than compliance issues. With a correct OEM 724525 head unit, you restore the precision of your DEF system, maintain emissions performance and help ensure your unit stays ready for duty when every second matters.

























































































































































































































































































