I'm a little disappointed, I've searched around and looked for Nitro capsules for this machine. The Vevor website has no information or links as to exactly which capsules to use. It has a plastic holder for the capsule that some companies recommend not to use pure N2 as it has more pressure than N2O capsules. The only capsules I can find in the stores in Switzerland are Kisag, and they are too long, I have to cut away part of the plastic cap for it to fit. I think if I had know how hard it was to find good N2 capsules, I would have purchased the iSi system, that one can get good N2 capsules.