Its wrong being able to sell these to the average punter, they are really only meant for a fixed appliance which must be installled by a licensed gas fitter anyhow.
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Around here I haven't seen any plumber bend copper for a final fitout. Everything seems to get connected at the wall with braided hose. Mixer taps, toilet cisterns, dishwashers,....
Flexible gas connections into sockets are allowed in Queensland including inside the house for unvented gas heaters. Flex gas hoses up to 2m are available readily from BBQ shops and probably Bunnings.
From memory the nut size are different.
As they are allowed here also but they are a different type of hose, the same as the rubber ones that come with space heaters, Im referring to the stainless braided hoses.
Unfortunately a lot of people do take the easy way out using flexi's, I personally prefer to bend up a bit of copper but it depends on the pricing of the job and customer preferance.
The price between copper and flexis aswell as the time factor can either win or lose you a job.
Mixer taps come with integral flexi's, as do dish washers.
I like to use chrome tube under a vanity and using a flexi to connect a cistern is just poor!