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Re: Image comments for guess the mysterious object...
Posted by: pro_junior
Date: 04/03/2012 04:33AM
wolfgang got it thumbs down
one of my first jobs was making these suckers...I ran a machine that punched out the round pieces for the top and bottom...the valve stem at the top is the same as you'd find on a car tire...not sure if there's a technical name for them, we called them plumber's plugs..biggest ones we made were 24" diameter and some of the bigger ones had a tube thru the center that had threads to screw in the pressure testing instruments...QC tested each of them over a certain size and occasionally one would go Boom! and we'd all jump then lol

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