Big whatzit. inside Pic update

[texan connection]

I dont have a clue on this, it was dug off a homstead ranging from mid 1800's to early 1900's.
Its cast and appears to be two pieces Thats a 7 stamped on the end.


scroll down for pics of inside

 

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[Zephyr]

My (bad) guess would be part of a steam-powered horn.

 

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[Charlie P. (NY)]

Hmmmm. Starting to look more like a muffler or spark arrestor now that we see no moving parts.

Really big siphon break fitting?