Why is the BBQ labelled for Universal LPG (ULPG) instead of for LPG?

Why is the BBQ labelled for Universal LPG (ULPG) instead of for LPG? main image

LPG is a mix of Butane and Propane. The mix proportions in Australia are mostly quite consistent, but not always. In other countries (like New Zealand) the mix proportions can vary more. The Ziegler and Brown Triple Grill has been tested and approved with a much wide range of propane-butane mixes than normal, and is labelled accordingly.