The Optimus cartridges are self sealing with a male screw valve on top of the cartridge. This screws directly into the appliance.
The cartridge complies with EN417
Use cartridge with appliance that complies with EN521
Camping Gaz cartridges are the pierceable type and are Non-resealable
Compass Point will deliver fuel to the event for you because it can’t be sent by post
Choose your fuel type from the drop down list