Wehrli Custom Fabrication WCF100559-BR Upper Coolant Pipe - Duramax Billet Aluminum

The Wehrli Custom Fabrication WCF100559-BR is a billet aluminum upper coolant pipe engineered as a direct replacement for the factory plastic or OEM coolant pipe found on Duramax diesel engines. Wehrli Custom Fabrication is a respected name in the performance diesel industry, known for producing precision-machined components that dramatically improve durability and longevity over stock parts.

This upper coolant pipe is CNC-machined from high-grade billet aluminum, eliminating the cracking, warping, and failure points commonly associated with the factory plastic coolant pipes. The result is a corrosion-resistant, pressure-stable upgrade that maintains proper coolant flow and helps prevent overheating and coolant loss.

Key Features:

• CNC-machined billet aluminum construction for superior strength and heat resistance
• Direct OEM replacement — no cutting, welding, or modifications required
• Anodized finish for corrosion resistance and long-term durability
• Eliminates the risk of cracked or failed factory plastic coolant pipe
• Precision fitment ensures proper sealing and coolant flow
• Available in multiple anodized color options to match your build

Wehrli Custom Fabrication products are manufactured in-house in Dorr, Michigan, and are designed to meet the demands of both daily-driven diesel trucks and high-performance competition builds. The WCF100559-BR is a straightforward, high-quality upgrade for anyone looking to eliminate a known factory weak point and add a touch of custom style under the hood.