What would the advantage of a piercable butane canister be?
All of the butane gas cartridges I have seen have a screwable top for attaching your stove, however, there are apparently also pierceable cartridges without a screwable top.
What would the advantage of this type of canister be or is this style just not seen in the U.S? (I went looking yesterday and the only ones I could find were screwable tops)
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The advantage of the "one way"/piercable canisters is that they are way cheaper (up to four times with respect to price per mass of gas according to German Wikipedia). Also they are "good enough" for many purposes, I.e. when you can leave the stove or burner attached for the lifetime of the canister.
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In UK I have only ever used the simple type. The female part of the screw thread is on the shroud which clamps around the gas cartridge, and the appliance screws into that, instead of the canister. So there is only one screw thread to manufacture for the re-usable shroud, instead of every cartridge.
Apart from the trade-off between the cost of the shroud and the cost of cartridges, an advantage is that appliances that use these cartridges don't need to match any thread size.
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