3Pcs Random Styles Camping Nozzle Bottle Convert Adapter Connector Stove Connector for Butane Canister to Screw Gas Cartridge

Love these things. They permit you to use the cheap gas cannisters that seem to be available in so many shops without having to chase around for the less common screwfits. They can be a bit delicate, so buy several at a time so you always have a spare!

Do not fit a cadac regulator

Perfect