Primus easy fuel duo is designed to be a stove you can take anywhere in the world and still acquire a compatible gas cartridge the unique gas cartridge attachment allows for a big range of valved gas cartridges to be used if you have ever tried to get screw in style cartridges very popular in the uk in france you will know the pain it can cause their almost exclusive use of the campingaz style of valve cartridges can cause real issues for uk travellers but this stove allows you to use either sty