I purchased an Airlift II and works amazing. I have replaced my heater core twice and wasted a lot of coolant and time trying various methods of bleeding without luck through the last couple of years. I hooked it up last night after replacing my coolant flange and it was a snap to replace the coolant without spilling in minutes. You do have to have a compressed air source. Optima Redtop Battery came back from the dead and I have heat with no leaky from coolant flange!