Wehrli Custom Fabrication WCF100647-GM Billet Coolant Heater Core Firewall Fitting

The Wehrli Custom Fabrication WCF100647-GM Billet Coolant Heater Core Firewall Fitting is a precision-engineered replacement for the failure-prone factory plastic GM heater core firewall coolant fitting. This direct-fit upgrade addresses a common weak point on Duramax trucks and other GM vehicles equipped with 6.6L engines.

Key Features:

• CNC-machined billet aluminum construction for superior durability
• Direct-fit replacement with 5/8" barb connection
• Double O-ring design for reliable sealing
• More resistant to heat and vibration than OEM plastic fitting
• Made in the USA
• Installs in minutes using OEM mounting location

This upgrade eliminates the risk of coolant leaks from the brittle factory plastic fitting, providing long-lasting performance and peace of mind. The precision-machined billet aluminum construction ensures resistance to the extreme heat and vibration found in diesel engine bays, making it an essential upgrade for both stock and modified GM trucks.