Worked very well with the check valve I also bought to flush the heater core on my truck. Little effort, I wish I knew this trick 40 years ago, just so I'll do it from now on. The only thing is I had to get it with a 3/4" female threaded end instead of a male threaded end (used a washing machine hose to get it working properly). All in all a great product, try it next time, it will make you a believer.
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