Flo Gas Bottle. 13kg Butane Cylinder. Suitable for portable gas heaters, barbecues etc. using standard Calor (or compatible) 21mm regulator. Tested and in good working condition. Empty. Compatible with bottles from Calor Gas, Shell Gas, CitiGas, BP Gas etc. Save £££s on cylinder deposit and pay refill cost only. Ideal as a spare so you never run out.