The flush fitting that was posted above looks like it would do the job easier in the future but it's one of those things that steals the eye in my engine bay.
This is the reason in my post that I suggest creating a short pig tail heater hose and affix to the Prestone unit. Then at flush time remove your heater hose, splice this unit in and remove it when done.
Also using this unit to fill your radiator when done,,,you eliminate possibility of leaving air pockets. If you wish to add anti freeze, merely open radiator petcock and allow sufficient water to drain out to make room.
Does not get any simpler or do a better flush than this.
