Wehrli 100742 Upper Coolant Pipe Kit | 2017-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax L5P

Features:

• Fits 2017–2019 L5P Duramax engines
• Replaces weak OEM rubber coolant hose
• Durable aluminum coolant pipe construction
• Includes silicone boots and T-bolt clamps
• Compatible with OEM GM radiators only
• Powder coated in your color of choice
• Improves reliability and engine bay appearance
• Withstands high heat and pressure conditions
• Designed for a clean and direct fit
• Ideal for performance and towing applications

Take Control Of Your Cooling System In Style

If you’re tired of the stock rubber upper coolant hose flexing, bulging, or just looking out of place in your engine bay, the Wehrli 100742 Upper Coolant Pipe Kit is a solid upgrade you’ll appreciate every time you lift the hood. Built for 2017–2019 GM 2500HD and 3500HD trucks with the 6.6L L5P Duramax, this kit replaces the OEM hose with a durable aluminum pipe that doesn’t just perform better, it looks a whole lot better too. It comes powder coated in the color of your choice, letting you match your engine bay theme or add a bold pop under the hood. This is more than just a cosmetic upgrade though. With reinforced silicone boots and high-quality T-bolt clamps included, you’re getting a complete kit that’s made to handle serious temperature and pressure without backing down. Whether you're daily driving, towing, or adding performance mods, this is a small change that brings big value. It’s the kind of upgrade that makes sense on every level, performance, durability, and visual appeal.

Built For Precision Fit And Long Lasting Strength

The Wehrli 100742 Upper Coolant Pipe Kit is engineered to deliver a precise and reliable upgrade for the factory upper coolant hose on 2017–2019 L5P Duramax engines. The OEM rubber hose is known to degrade over time under heat and pressure, making this aluminum replacement a more stable and long-lasting solution. Constructed from high-grade aluminum, the pipe resists flexing and expansion, helping maintain consistent coolant flow across varying operating conditions. Each kit includes heavy-duty silicone boots and T-bolt clamps that offer superior clamping force and leak prevention, even under extreme temperatures. The powder coated finish not only enhances corrosion resistance but also provides a clean, custom look. This pipe is designed to fit seamlessly with OEM GM radiators, so it installs with minimal effort and no guesswork. However, compatibility with aftermarket radiators may vary, so it’s important to confirm your setup before installation. This kit is ideal for those who want a no-nonsense cooling system upgrade that blends performance and durability with a custom-built appearance.

Fits: 2017, 2018, 2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax L5P

Notes:

• Designed to fit 2017–2019 L5P Duramax engines only
• Replaces the OEM rubber upper coolant hose
• Kit includes pipe, silicone boots, and T-bolt clamps
• Intended for use with factory GM radiators
• Fitment issues may occur with aftermarket radiators
• Powder coated finish available in multiple colors
• Offers both performance and visual engine bay enhancement
• Not intended as a universal fitment part
• Check radiator compatibility before purchasing