Wehrli WCF100742-IP Upper Coolant Pipe Illusion Purple for L5P 17-19

Vehicle Fitment

• 2017-2019 Chevrolet Silverado 2500HD/3500HD (6.6L Duramax L5P)
• 2017-2019 GMC Sierra 2500HD/3500HD (6.6L Duramax L5P)

Fitment Notes

• Designed for use with the OEM GM radiator. Aftermarket radiators may cause fitment issues.
• Replaces GM part number 84094878.

Features

• Replaces the factory rubber upper coolant hose with a fabricated aluminum pipe
• Aluminum construction resists the cracking and degradation common to rubber hoses over time
• Includes silicone boots and stainless steel T-bolt clamps for a secure, leak-resistant connection
• Finished in eye-catching Illusion Purple two-stage powder coat
• Made in the USA

Specifications

• Material: Aluminum
• Finish: Illusion Purple Powder Coat

Included Components

• 1x Upper Coolant Pipe
• Silicone Boots
• Stainless Steel T-Bolt Clamps

Product Description

The factory rubber upper coolant hose on the L5P Duramax is a wear item - over time, heat cycling causes rubber hoses to harden, crack, and eventually fail, often at the worst possible moment. The Wehrli WCF100742-IP replaces it with a fabricated aluminum pipe that doesn't degrade the same way, paired with silicone boots and stainless T-bolt clamps for a connection that holds up far longer than the factory setup.

As Wehrli themselves note, this isn't a horsepower part - it's a durability and appearance upgrade, and the Illusion Purple two-stage powder coat finish makes it a standout piece in an otherwise all-business engine bay. It's a direct swap for the OEM pipe using the stock GM radiator, making it an easy addition alongside other Wehrli cooling and dress-up components.