The 10 minute exchange process means no more waiting for the engine to warm up. Our engine off inch feature removes pulleys, belts, and fan blades from the safety equation. The vacuum mode creates a push/pull inch exchange process allowing the technician to safely remove high pressure in a hot system. Leak check feature allows the technician to test for leaks prior to refilling and the two clearly marked valves and an easy-to-read gauge make this machine very easy to use. No electricity is required and 90 pounds per square inch of shop air drives the exchange process, as well as the 2 GPM pump on the waste tank. Two external new coolant supply tanks allow on-board storage of two different coolant types.