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The Wehrli auxiliary coolant tank kit for 2020–2025 Duramax L5P replaces the original plastic reservoir with a fabricated aluminum tank in Flat Black. It mounts in the OEM location using stock mounting points and includes a black anodized CNC billet cap, mounting hardware, preformed hose and overflow fitting. Designed as a direct-fit upgrade, installation requires only basic hand tools.
Wehrli 20-24 Duramax L5P Auxiliary Coolant Tank Kit - Flat Black
