4378048 | Genuine Cummins® Diesel Exhaust Fluid Header Turbocharger kit This means air or water

This means air or water is in the system — both can damage the HPU

so you can stop a heavy vehicle with minimal effort

Blown ECM fuse

Purpose of using 165-472-0004:

Modulates brake pressure during hard braking to keep the wheels spinning

4378048 | Genuine Cummins® Diesel Exhaust Fluid Header Turbocharger kit This means air or waterDescription: A Diesel Exhaust Fluid (DEF) header 4378048 is a key component in a diesel vehicles emissions control system, specifically within the Selective Catalytic Reduction (SCR) system. The DEF header (also called a DEF tank head or DEF sender assembly) is the unit mounted on or inside the DEF tank. It monitors and manages the Diesel Exhaust Fluid thats injected into the exhaust to reduce harmful nitrogen oxide (NOx) emissions. Part Number: