Wehrli 99-23 GM Billet Coolant Heater Core Firewall Fitting

What you get here is a direct-fit replacement for the factory plastic GM coolant heater core firewall fitting. This part is known to be a common failure point on many Duramax trucks and other GM vehicles, so upgrading to this billet aluminum piece is a smart move to prevent leaks. It's made in the USA and designed to be more resistant to heat and vibration than the original plastic part.

This fitting features a clear anodized finish to help resist corrosion, and it uses a double O-ring seal for added security. It's a straightforward upgrade that replaces GM/AC Delco part number 15032062. The 5/8" barb connection makes it easy to attach your heater hoses.