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We will be closed June 27th, 2026 - July 6th, 2026. In store pickups will be unavailable during this time. A majority of orders will ship out normally but may experience a delay in handling time. if you have any questions, please use our live chat before placing an order.
Wehrli Custom Fab WCF100155 Billet Heater Core Firewall Fitting

Wehrli Custom Fab WCF100155 Billet Heater Core Firewall Fitting

by Wehrli Custom Fab
SKU WCF-WCF100155
$39.77 - $39.77
$39.77
$39.77 - $39.77
$39.77
Product Availability
  • Ships Directly From The Manufacturer
    Ships From Manufacturer
The Wehrli Custom Fab WCF100155 Billet Heater Core Firewall Fitting from GAP replaces the plastic fitting on your 2001-2023 GM 6.6L Duramax. The factory plastic GM Coolant Heater Core Firewall Fitting is a common failure point on Duramax trucks and other GM vehicles. This billet aluminum direct-fit replacement is more resistant to heat and vibration. Prevent leaks with this easy to install upgrade.

Features:
  • Billet Aluminum
  • Double O-Ring Seal
  • Clear Anodized Finish To Resist Corrosion
  • Replaces Failure Prone Plastic Factory Fitting
  • Direct-Fit Replacement With 5/8" Barb Connection