It doesn't appear to be used, though the brass nipple (or "needle") has corroded a bit. I am wondering if the needle can be unscrewed and a hose plumbed directly into valve assembly? If so then that makes the special adapter unnecessary.
Here's the burner column/valve assembly from my Gerry stove which uses the same type of fuel. Notice that this needle does
not unscrew which is why I needed the adapter of the type that I have.
You would be better off if you had and adapter that would thread into where the needle unscrews from on your stove (see attached photo). In the photo, the red arrow indicates the fitting on the end of the gas tube of the type that I bought on eBay for the Chinese S-9 stove. The slightly darker piece is a double threaded adapter. The left side of the adapter (as seen in the photo) threads directly into the EFI type stove. The right side threads into the S-9 gas tube.
HJ
 Adapter.jpg "Hank Roberts (EFI) Adapter.jpg")
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