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• Threaded cap and adapter for newer GM "threaded style" radiator openings.
• Eliminates trapped air pockets which can cause erratic cooling system and heater performance.
• Controls amount of coolant entering system and enables unattended filling of the cooling system.
• Eliminates squeaky belts caused by coolant overflow and protects the environment.
• Includes four adapters which fit most domestic and foreign vehicles and light trucks.
• Angled neck for use with radiator caps placed at an angle.