Anyone recognize this part?

[chev-obsession]

I found this tube in the back of a 75-ish K-5 blazer in a junkyard. I was thinking it was a stove pipe for the heat riser system for 67-72. But after looking at it, it looks similar but not the same. There is a little cup on the bottom that the tube slips into. The tube is belled out at the top and necked down at the bottom, as if something slips into the top part and tube slips into another part on bottom.

Anyone have any idea what it is?
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