are approved by the DOT in the US, TUV in EU. Not sure about the rest of the world. The operative, issue is that if they are not approved, they will not be refilled in the US. Not sure about the rest of the world.
Twenty pound tanks
, if you have the space are very convenient for extended cruising
. The steel
tank will work on the boat, I carried one for a while, just put silicon aquarium sealer on the bottom rim, protects from rust.
I do however have the composit tanks now. They work great, and I believe are well worth the slighly extra cost over a steel
. They are quite signficantly less than the aluminum
and I like them a lot better!
cost vary significantly. In the Bahamas
it was fairly expensive. In the US, some places will only filll a bottle, one price
. Many places will sell by the gallon, or pound. Some places will only do bottle exchanges. Not a good thing with that nice aluminium tank, or the composit.