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Purchase the Wehrli Custom Fab WCF100469 Transmission Cooler Thermostat Bypass Plug from XDP and get a direct-fit replacement for the failure prone factory thermostat. This Thermostat Bypass Plug can reduce fluid temperature from 15-50 degrees Fahrenheit by reducing fluid flow restriction to the trans cooler. When the factory valve fails, trans fluid is forced around the cooler in warm weather conditions that cause dangerous fluid temperatures for both built and stock transmissions. This plug is perfect for applications that perform heavy towing in warm climates.