The truth about so-called "Freeze-out" plugs
This has come up a few times at work. I hear people mentioning freeze-out plugs, and every time I ask what they're for, people tell me that they're there to prevent damage if the coolant freezes. At this point I always stop and correct them. Freeze protection is a nice side-effect, but what they're really for is to make it easier to wash out the casting sand during manufacturing.
Just a little fun fact. If anyone has any more fun (or not particularly fun) facts along these lines, share 'em.
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