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
4378050 Genuine Cummins Tank DEF Header
4378050 Genuine Cummins Tank DEF Header
4378050 Genuine Cummins Tank DEF Header
4378050 Genuine Cummins Tank DEF Header

4378050 Genuine Cummins Tank DEF Header

P/N: 4378050 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 4378050 is a genuine Cummins tank DEF header used in diesel exhaust fluid system service. This header supports DEF tank monitoring and fluid system communication required for emissions aftertreatment operation.

Product Features

The 4378050 tank DEF header is manufactured to Cummins factory specifications for DEF system operation.

  • Supports diesel exhaust fluid tank monitoring functions.
  • Provides system input for SCR aftertreatment operation.
  • Helps maintain DEF supply communication with emissions controls.
  • Integrates with OEM DEF tank system components.
  • Assists proper diesel exhaust fluid system operation.
  • Designed for factory DEF tank service applications.

Technical Specifications

Condition New
Part Number 4378050
Brand Cummins
Part Type Tank DEF Header
Weight 10.0 lbs


Installation Notes

The 4378050 should be installed after inspecting the DEF tank opening, sealing surface, connector area, and fluid fittings for contamination or damage. After installation, verify DEF system communication and confirm there are no leaks at the tank interface.

Always verify part number, DEF tank configuration, connector style, sealing surface, and emissions system application before installation.