Brass Tube Identify ?

[71-SS350]

Digging thru a small parts stash of misc. I came across this small brass formed tube, 5/8'' ID at the large end and 9/16'' ID at the small end. Measures about 4'' in length and is machine formed. Any one have any idea what it is? Not sure why I saved it or where/when I acquired it.

[BillsCamino]

Looks like something that broke off a heater core. Does the smaller end look like it was soldered?

[71-SS350]

Bill, thanks for the reply. Does not appear that either end had ever been soldered but who knows. Thanks again for the reply.

[shadowgray396]

Looks like something that broke off a heater core. Does the smaller end look like it was soldered?

X2, Is for the heater core