Wehrli Custom Fabrication 100155 Billet Heater Core Firewall Fitting

The Wehrli Custom Fabrication 100155 Billet Heater Core Firewall Fitting is a precision-machined aluminum upgrade designed to replace the failure-prone factory plastic coolant fitting on GM Duramax diesel trucks. This direct-fit replacement eliminates a common leak point that plagues the OEM plastic component, which deteriorates over time due to heat exposure and engine vibration.

Key Features:

• CNC-machined billet aluminum construction for superior durability and heat resistance
• 5/8-inch hose barb connection for secure coolant line attachment
• Double O-ring seal design ensures leak-free operation
• Clear anodized finish resists corrosion and withstands harsh engine bay conditions
• Direct-fit replacement requiring no modifications to factory mounting location
• Made in the USA with precision manufacturing standards

This upgrade fitting provides peace of mind by replacing the weak factory plastic component before it fails, preventing potential coolant loss and overheating issues. The robust aluminum construction handles extreme temperature cycles and vibration far better than the OEM part, making it an essential reliability upgrade for Duramax owners.