Freeze Plug Diameter

[Tom Beaver]

In the past the foundry used to in-bed wire in the sand molds to act as reinforcing bars.  After casting the block they would flush the sand out of the block cavity and usually removed the wire also, but not always.  I have seen this a time or two.  This is most likely what you see and you can just remove it and throw it away.

Tom Beaver

[sjocad]

I found it.
It was an old velding rod" there.May be lost when they took the dirt out.Now its ok.
Thanks folks...