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Cast iron radiator leaks.
I took some of my junk radiators apart just to see if I could and there are paper gaskets between the sections. The rads are just like the Burnham classics and go together with the left/right pipe thread nipples (I call 'em turnbuckle nipples). If they were in there during powder coating the gaskets are gone now for sure. Getting them to seal without the gaskets will be a neat trick.