Freightliner DEF Headers

Grizzly™ DEF Header: A Reliable Alternative for Freightliner DEF Systems

If you're running a Freightliner and dealing with DEF system issues, you know how critical it is to have dependable components—especially when replacements are hard to come by. That’s where the Grizzly™ DEF Header comes in: a rugged, high-performance solution designed to meet the demands of Freightliner applications and beyond.

Built for Freightliner, Ready for Harsh Conditions

The Grizzly™ DEF Header is fully compatible with major DEF dosing units used in Freightliner trucks. It integrates essential fluid sensing capabilities, including:

DEF level monitoring
Temperature sensing (with or without concentration detection)

This integration simplifies system design and ensures reliable communication with your existing setup.

Cold Weather Performance You Can Count On

Freightliner trucks often operate in extreme environments, and the Grizzly™ DEF Header is built to handle it. Its engine coolant-powered heater thaws DEF in temperatures as low as -40°F (-40°C), keeping your system compliant and operational even in the harshest conditions.

Hard to Find? Not Anymore.

Many Freightliner owners report long lead times and limited availability when trying to source DEF headers through OEM dealers. The Grizzly™ DEF Header offers a reliable alternative that meets OEM specifications for fit, form, and function—without the wait.

Optional Items

To support a wide range of Freightliner configurations, Grizzly offers optional components such as:

Remote fill adapters and vents
Lockable caps
Coolant control valves
Electrically heated suction, return, and pressure hoses
Mounting brackets

These options make it easy to tailor the system to your specific needs.

OE-Compatible, Field-Tested

While the Grizzly™ DEF Header may look different from the original Freightliner part, it’s engineered to match OE standards. You get the same performance and reliability—often with better availability and support.

Don’t let DEF system downtime slow you down. Choose the Grizzly™ DEF Header for your Freightliner and keep your fleet moving.

See our available products below:

Part # / Link	Description	Crosses
GA202323	Grizzly \| DEF Header (O.E. Design) 20in. \| Freightliner / Cummins ISB / ISL	0431353000, 0431353003, 0431353006, ASPFL2323
GA202324	Grizzly \| DEF Header (O.E. Design) 18in. \| Freightliner / Cummins ISB	0431354002, 0431354003, 0431354004, ASPFL2324
GA202325	Grizzly \| DEF Header (O.E. Design) 20in. \| Freightliner / Detroit Diesel DD13 / DD15	0427881000, 0430798000, 0431677000, 0431893000, ASPFL2325
GA202326	Grizzly \| DEF Header (O.E. Design) 20in. \| Freightliner / Cummins X12 / X15	0431353001, 0431353002, 0431353004, 0431353005, ASPFL2326
GA202327	Grizzly \| DEF Header (O.E. Design) 20in. \| Freightliner / Detroit Diesel DD13 / DD15	0433656000, ASPFL2327