GMC Sierra 3500 Upper Coolant Pipe - Wehrli - Semi-Gloss Black (2020-2025). Replace the factory rubber upper radiator hose with a precision-fabricated aluminum hard pipe built for the L5P 6.6L Duramax.

Designed to work with the OEM GM radiator, this Wehrli Custom Fab upper coolant pipe delivers a clean, durable solution using silicone boots and stainless steel T-bolt clamps for a secure connection. It fits stock trucks with no cutting or modifications and installs with basic hand tools. The semi-gloss black powder coat resists corrosion while improving under-hood organization. Direct replacement for GM part numbers 84813629 and 85122989. Note: aftermarket radiators may cause fitment issues.

Features

• For 2020–2025 GMC Sierra 3500 L5P 6.6L Duramax
• Fabricated aluminum hard pipe, semi-gloss black powder coat
• Includes silicone boots and stainless steel T-bolt clamps
• Fits stock trucks; basic hand-tool installation
• For OEM GM radiator; replaces 84813629 and 85122989

Have questions or planning a build? Call us—our team is ready to help. We have locations in Austin, Texas and the Los Angeles, California area offering installation and customization services at both shops: 512-982-9393 (TX) and 562-981-6800 (CA).

If you’re considering multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov