DEF/Adblue/SCR injector nozzle for the Powerstroke 6.7L engine in the Ford F250 and F350. This nozzle sprays DEF fluid into the exhaust stream before the SCR catalyst.

This nozzle can get clogged over time, requiring replacement. A malfunctioning DEF nozzle or system will eventually prevent the truck from starting. Long highway tips, rather than short around-town trips, will help prevent this nozzle from getting clogged.