Wehrli WCF100155 Billet Coolant Heater Core Firewall Fitting | 99-22 GM GM 6.6L Duramax 2500HD / 3500HD

The factory plastic GM Coolant Heater Core Firewall Fitting is a common failure point on Duramax trucks and other GM vehicles. Our made in the USA, billet aluminum direct-fit replacement is more resistant to heat and vibration. Prevent leaks with this easy to install upgrade.