Guess what this is...

I was going through all the misc parts I have collected and looking at some of the stuff my dad collected and found this.
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My dad made it, I don't rember why. But I do know what it is.9

It is 22 inches long, 20 1/2 to the hose clamp about 3/16 diameter. It has 2 wires coming out of one end and the other is soldered closed. It is made from soft copper tubing.

Hint it has a purpose associated with a 273 but not exclusively.

WHAT IS IT?

GOOD LUCK