Airlift II: HD – (Approved by International Truck) Built to remove airlocks in the HD cooling system. It eliminates the time consuming process of refilling and bleeding cooling systems by creating a vacuum that refills the entire system in seconds, including the heater core, EGR coolers, intercoolers, and aftercoolers . Equipped with a 90 degree angled gauge to accommodate tight fit applications it also checks for leaks while under vacuum . Features include a cone adapter that fits most systems and an extra-long hose for hard to reach areas . OEM Approved by International Truck 550500HD No – Durable Long-Lasting New General Purpose