Weber Q1200N gas barbecues are generally compatible with small, portable gas cylinders, which are often available as disposable cartridges. A normal 7.5 kg plastic cylinder is not directly compatible as it requires a different connection. For a larger gas cylinder, an adapter may be required to connect it to the barbecue. However, the specific requirements for the Q1200N may vary, so it is advisable to consult the operating instructions or the manufacturer.