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Wehrli transmission cooler thermostat bypass plug for 2017–2019 Chevrolet and GMC Duramax L5P trucks and compatible GM models listed. As a direct replacement for the OEM thermostat, this CNC‑machined billet aluminum bypass plug reduces flow restriction to the trans cooler and can lower fluid temperatures by 15–50°F in tested applications. Black anodized, easy to install and reversible for cold‑weather use.
Wehrli 17-19 L5P Duramax Billet Anodized Transmission Cooler Thermostat Bypass Plug
