For fleet operators using Global Environmental Products systems on Cummins ISL engines, the DEF (Diesel Exhaust Fluid) head unit is a silent but essential part of the emissions chain. The Global Environmental Products Cummins ISL DEF Head Unit (OEM GS335620, Tamerx part 4310-11-7) delivers the monitoring and control your SCR (Selective Catalytic Reduction) system depends on. A failure or drift here can lead to error codes, derates, or emissions noncompliance—none of which you want to face in the field.
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Monitors DEF fluid level, temperature, and urea concentration, sending accurate signals to the ECU
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Regulates precise dosing of DEF into the exhaust stream so NOx reductions stay efficient
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Built to meet OEM GS335620 tolerances for plug-and-play compatibility with Global Environmental Products / Cummins ISL systems
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Helps prevent warning codes, fault codes, and engine derates triggered by sensor drift or inaccurate feedback
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Designed to survive vibration, thermal cycling, and corrosion from DEF fluid
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Includes a 40-micron filter to help guard downstream injectors from contamination
Don’t let a degraded DEF head be the weak link in your emissions infrastructure. Installing the correct OEM GS335620 / 4310-11-7 DEF Head Unit restores your system’s accuracy, stabilizes SCR performance, and protects your vehicle from surprise faults or compliance issues. In modern diesel systems, precise feedback is everything—and this module is one you can’t afford to get wrong.