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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