This filler cap came with a tag marked “butane”. It fits a Coleman stove (eg a Peak). I’ve not seen one before. Rattling around in my head, I’m wondering does @teckguy_58 know about this? Cheers Tony
Amish made filler caps. Brass - AMISH MADE! Coleman Camp Stove or Lantern Filler Cap with Tire Valve - - Amazon.com
I made a similar one that I keep on the work bench. Handy way to over pressurize a fount when I'm testing for leaks after an overhaul. quicker than my usual practice of 60-70 pumps.
I agree that is an Amish cap for pressurizing with a bicycle pump. Perhaps Kerry was experimenting with running butane in a WG stove? ….Arch
I'd be interested in one if they made them for Svea/Optimus gas caps. Looking at the Amazon ad, it only got a one star review.