I have used these for 30 or more years for a very fast and quite good reverse flush. Certainly beats crawling under the car to open jammed up block and radiator petcocks,,or worse yet removing bolt in plugs from the block.

You need not have it installed permanently if for cosmetic purposes,,,just tap unit in before flushing and remove when done. Also flushes out heater which simple draining does not.

I also leave engine idling while flushing. Flush until coolant runs clear out of top of radiator. Always keep water flowing from hose while engine running as otherwise you can damage water pump from lack of lubrication that coolant provides.

Some 15 minutes for whole job. Your cooling system will love you, therefore it will treat you well.

http://www.amazon.com/Prestone-AF-KIT-Flush-Fill-Kit/dp/B000CCFY5W