|A two legged butane adapter (lying on it's back)|
|This type of butane adapter has a large hook (bottom) and a smaller hook (top). The smaller hook fits through the notch in the collar of a butane canister.|
|A butane two legged butane adapter fitted onto an empty butane canister.|
You then hook the fuel hose from your gas stove to the adapter as shown below.
|A butane adapter, attached to a butane canister with a stove's fuel hose attached to the adapter.|
Now, I got mine on eBay from a seller called Plus2City from Hong Kong. Plus2City also appears to be behind a couple of other online sellers that sell this type of adapter. All of the adapters from Plus2City and allied sellers appear to be worthless (or worse, dangerous) junk. Maybe there's some other source that is producing good quality adapters of this type, but I haven't seen any yet. Sorry to be so blunt, Plus2City, but clean up your act, and I'll put up a much nicer post. What you're selling now is junk at best and dangerous at worst.
Butane adapters of this type are definitely not recommended.