mmmmartin
Random geezer
important difference: the screw canisters are usually propane and butane and last a long time, giving a great heat. the non-reuseable ones are butane and give low heat, so die quickly. that is why they are cheaper - and have a poor seal. If you want screw canisters try fishing/DIY shops, etc. They are the same fitting used on blowtorches. The blowtorch ones are a different shape - thin and tall - but do the same job. This idea that the whole of Spain/France etc have no screwtop gas canisters is cobblers - look in a different shop.