Our Duramax Turbo Thermostat Delete Plug is designed to make it easy for you to install a non-water-cooled turbo. Our plug threads in place of the factory coolant thermostat that feeds your OEM turbo. Key Features: - Our plug threads in place of the factory coolant thermostat that feeds your OEM turbo - GRD661001 Compatible with: Duramax, Engine & Engine Parts