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The Wehrli auxiliary coolant tank kit for 2020–2025 Duramax L5P swaps the factory plastic reservoir for a fabricated aluminum tank in WCFab Grey. It installs in the OEM location using stock mounting points and includes a black anodized CNC billet cap, mounting hardware, preformed hose and overflow fitting. The direct-fit configuration is compatible with stock trucks and installs with basic tools.
Wehrli 20-24 Duramax L5P Auxiliary Coolant Tank Kit - WCFab Grey
