Wehrli Add to Cart Wehrli 17-19 L5P Duramax Billet Anodized Transmission Cooler Thermostat Bypass Plug - WCF100469 MSRP: $56.00 Was: Now: $54.32 Wehrli 17-19 L5P Duramax Billet Anodized Transmission Cooler Thermostat Bypass Plug