Butane Fill Valve

Where would I find a butane fill valve. The little brass valve found on the bottom of any butane powered lighter/torch. I can’t seem to find them anywhere online. I need one that is threaded so that I can drill a small hole and insert it. Doesn’t need a strong seal like a ligher would, just enough to keep the butane in momentarily. Anyone know where I would find such a thing? Thanks in advance!

It would probably be easiest just to take one out of a cheapo gas station novelty lighter.