This accessory will enable two types of carbon dioxide products to run from a carbon dioxide tanks. Can be used as a carbon dioxide regulating connector for aquariums or fish tanks. Simply connecting the separator to your carbon dioxide tanks and connecting 2 hoses to your product to use. Easy Installation: With the CO2 Refill Adapter, You can fill CO2 cartridges simply yourself by connecting a commercial CO2 bottle with your pink CO2 cylinde with quick connecting. It is none longer necessary to exchange your empty CO2 cylinders, none Complicated towing with our .