Wehrli Custom Fabrication WCF100742-BB Duramax Upper Coolant Pipe Kit Illusion Blueberry - L5P

The Wehrli Custom Fabrication WCF100742-BB is a direct-fit aluminum upper coolant pipe kit designed to replace the factory OEM rubber upper coolant hose on 2017–2019 GM 6.6L L5P Duramax diesel trucks. Finished in WCFab's distinctive Illusion Blueberry two-stage powder coat, this kit delivers a show-quality appearance alongside a durable, long-lasting upgrade over the stock rubber hose.

The L5P generation Duramax increased coolant plumbing to a 2.0-inch diameter to support its higher horsepower output and larger radiator. This WCFab pipe is engineered specifically to those updated dimensions, rerouting coolant from the thermostat housing directly to the OEM GM radiator for improved flow and a cleaner engine bay presentation. It is designed for use with the factory GM radiator.

Kit Includes:

• Powder-coated aluminum upper coolant pipe (Illusion Blueberry finish)
• Silicone boots
• T-bolt clamps

Key Features:

• Replaces factory rubber upper coolant hose with a rigid aluminum pipe
• Illusion Blueberry two-stage custom powder coat finish
• Direct-fit replacement — compatible with OEM GM radiator
• Pairs perfectly with WCFab intercooler pipes, intake horn, and resonator delete pipe for a cohesive engine bay look
• Proudly Made in the USA by Wehrli Custom Fabrication, DeKalb, Illinois

Wehrli Custom Fabrication is renowned for precision fitment and premium finish quality on all of their diesel performance components. The WCF100742-BB is an ideal complement to any L5P engine bay build and ships ready to install.