Ted,
I think you might be talking about the tall black can you can see in my pics, it's actually a 220gram can of butane, I bought 4 at once so I should be right to go for the forseeable future..... I think they're for use on those little portable gas powered BBQ hotplates, it screws straight onto the fitting which was supplied with my engine, cost me all of $5 aussie each at my local Bunnings, for those overseas people, Bunnings is a large hardware type warehouse here in Aus, they sell nearly anything to do with household/gardening/camping etc... these little butane cans last for yonks, I've done well over 50 starts so far on the one can, it's nearly empty now so I think that's about its limit. I've had no issues with my JJ1800 lighting off on these so I can recommend them, still on the original glow plug too.

Cheers,
Smithy.