Skip to content
Free Standard Shipping on Eligible Orders Over $100 in the Contiguous U.S.
Free Standard Shipping on Eligible Orders Over $100 in the Contiguous U.S.
Search
4378045 Genuine Cummins Diesel Exhaust Fluid Header
4378045 Genuine Cummins Diesel Exhaust Fluid Header
4378045 Genuine Cummins Diesel Exhaust Fluid Header
4378045 Genuine Cummins Diesel Exhaust Fluid Header

4378045 Genuine Cummins Diesel Exhaust Fluid Header

P/N: 4378045 Manufactured by: Cummins
$749.00 - $749.00
$749.00
$749.00 - $749.00
$749.00
2 in Stock
Condition: New
We accept:
  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa
Not Sure Which Part Fits?
Our support team is here to help.
+1 (828) 209-8010
Monday – Saturday | 8:00 AM – 8:00 PM (EST)
Fast 2–3 Day Shipping
30-Day Returns
In Stock & Ships Fast
Expert Support Available
2-Year Warranty

At Line Truck Parts LLC, we are committed to providing reliable automotive parts and a transparent customer experience. Eligible parts purchased directly from our website are covered by a 2-Year Limited Warranty, giving you added confidence in your purchase. Learn More

Product Overview

The 4378045 is a genuine Cummins Diesel Exhaust Fluid (DEF) Header designed for Navistar applications utilizing a 15-gallon DEF tank configuration. This component serves as a critical interface within the DEF storage and delivery system, supporting fluid monitoring functions required for proper SCR aftertreatment operation.

Product Features

The 4378045 diesel exhaust fluid header is manufactured to Cummins specifications for DEF tank monitoring and aftertreatment system operation.

  • Genuine Cummins diesel exhaust fluid header
  • Designed for 15-gallon DEF tank applications
  • Configured for Navistar vehicle platforms
  • Functions within SCR emissions control systems
  • Supplied as a DEF sensor kit assembly
  • Engineered for OEM DEF fluid management systems
  • Manufactured as a new service component

General Specifications

Condition New
Part Number 4378045
Brand Cummins
Part Type Diesel Exhaust Fluid Header
Vehicle Application Navistar
Tank Capacity Compatibility 15 Gallon DEF Tank
Configuration DEF Sensor Kit
Weight 10.0 lbs


Installation Notes

The 4378045 DEF header should be installed using the service procedures specified for the applicable DEF tank and aftertreatment system configuration. Inspect tank connections, electrical interfaces, and sealing surfaces before installation to help ensure accurate DEF system monitoring and reliable operation.

Verify part number, VIN, engine configuration, production date, emissions package, and applicable factory options before installation.