GMC Sierra 3500 Upper Coolant Pipe by Wehrli, Gloss Black, 2020–2025. This fabricated aluminum replacement swaps the stock rubber upper radiator hose on L5P 6.6L Duramax models for a sturdy, clean-looking hard pipe engineered for the OEM GM radiator.

Built to refresh the engine bay and handle daily use, this pipe features a durable gloss black powder coat and precise fitment for stock trucks with no modifications required. It installs with basic hand tools and includes silicone boots and stainless T-bolt clamps for a secure connection. Intended for use with the factory GM radiator; aftermarket radiators may cause fitment issues. Cross-references GM part numbers 84813629 and 85122989.

Features

• 2020–2025 GMC Sierra 3500, L5P 6.6L
• Fabricated aluminum hard pipe
• Gloss black powder coat
• For OEM GM radiator only
• Silicone boots, stainless T-bolt clamps
• Direct fit; no mods; basic-tool install
• Replaces GM 84813629, 85122989

Have questions or planning a build? Call our Texas shop at 512-982-9393 (TX) or our California location at 562-981-6800 (CA). We serve enthusiasts from our Austin, TX and Los Angeles, CA area facilities, where we also offer installation and customization services.

If you are 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