The maximum fill level for portable cylinders is 80%, to allow room for expansion of cylinder contents. The empty weight is stamped on the cylinder, so the amount of gas which is left can be estimated by weight. Some cylinders can have a contents gauge fitted.

Cylinders can only be refilled legally if they have a valid 10-year stamp on the collar, neck or foot ring. If out of date, the cylinder must be tested before refilling. Cylinders must be tested at an authorised test station. If serviceable, they are re-stamped for another 10 years' use. If not, they will be destroyed.

Names and addresses of authorised test stations can be obtained from the Yellow Pages under "Gas Cylinder Testing", Standards Australia, your gas supplier or the Energy Information Centre.

Never dispose of unserviceable cylinders at the rubbish dump or in the rubbish collection - they must be disposed of through an authorised test station, LPG supplier or filler.

Never fill portable LPG cylinders from automotive (Autogas) dispensers - this is both illegal and dangerous.

Autogas is a mixture of propane and butane. Australian LPG appliances are designed ONLY for use with commercial LPG which is predominantly propane.