The Fleece Performance Duramax Turbo Thermostat Delete Plug is designed to eliminate the stock coolant feed line when installing a non water cooled turbocharger on your Duramax. It provides clearance for larger intake plumbing, is CNC machined from 6061 T6 aluminum, and uses an o ring seal to prevent leaks. Features Allows Use of Non Water Cooled Turbochargers O Ring Seal for a Leak Free Installation Provides Clearance for Larger Intake Plumbing