Gas cartridges from various manufacturers with a screw valve work perfectly. Need one or two of the medium size per season.

Attention campinggaz cartridges need an adapter.

I don't know how to use fuel, I don't think so! No adapter included in the delivery. 450g gas cartridge lasts for approx. 7x morning coffee, 7x camping dinner for 3 people

The Primus gas cartridges fit directly onto the standard hose. There are different sizes of cartridges. I usually use the 450. I need half a cartridge for a week (1 pot of coffee and 1 kettle of water for tea in the morning, meat / fish or vegetables on cast iron pans in the evening). There are various adapters for other cartridges and also for larger gas cylinders. But that is a science in itself....