Adapter as alternative for a fuel cartridge

The adapter cartridge has a fuel feed device and an interface on the load side for outputting fuel. The fuel output interface designed in accordance with the corresponding interface of the fuel cartridge. The adapter cartridge has a housing reproducing the fuel cartridge housing and a fuel passage from the fuel feed device to the fuel output interface. Independent claims are also included for the following: (a) an adapter fitting for supplying fuel to a device designed to operate with a fuel cartridge (b) a fuel supply device (c) and a fuel line.