Robinairs No. 75260 Coolant Refiller with Airlock Preventer uses a compressor powered vacuum to completely fill vehicle cooling systems in seconds without creating troublesome air bubbles. Vacuum opens the thermostat, eliminates air in the system, then fills cooling system, including heater core, completely - no bleeding required. Also use to determine cooling system integrity by checking for system leaks under vacuum. Universal, fits-all cone adapter works with any radiator or overflow bottle filler neck, eliminating the need for adapters. Built-in gauge protector protects against inadvertent damage. Tool includes clear hose, filter, and instructions. Robinair, a Bosch Automotive Service Solutions brand, is a global leader in service tools and equipment based in Owatonna, Minnesota. Robinair is recognized throughout the world as the quality and performance leader in AC/R evacuation tools and this position has led to its success with the full range of products that serve the heating/ventilating/air conditioning/refrigeration (HVAC-R) and mobile markets, which includes the automotive aftermarket along with other industries such as agriculture and construction.