3top,
We rely on the IATA Dangerous Goods Manual, which gives all relevant data on what can be carried, and also the relevant UN number needed on approved Jerry Cans.
The only approved cans that we have here in Oz are the black plastic ones with UN 3H1Y 1.2 180 stamped on the base. All the metal ones Made In China aren't approved.
Next time you're in Melbourne, they're available at the RACV for about $A35
