co2 cylinder fire fighting good quality reasonable price moq: 1000pcs factory in china, mainland co2 cartridge inflator has ISO/CE/DOT/PI/MSDS CERTIFICATIONused widely in drinking water machine, red wine machine, tyre aerating toolsmaur conditioner cleaner, life jackets!moq: 1 sampleour cylinder has three kinds.one without screw,one has 1/2" screw,one has 3/8" screw.thanks and regards!