?This is Aquarium Fish Tank Co2 Atomizer System / Diffuser 12/16mm. Newly Safely-NutsR system designed for lock on the CO2 in atomize Stage. The usage of CO2 will much less than even， it also come out with complete dissolved rate and produces excellent effect for the aquarium. Good choice for you!<br>                                    Features            100% brand new and high qualityEasy Setup &amp; USENewly Safely-NutsR system designed for lock on the CO2 in atomize Stage.The usage of CO2 will much less than even，it also come out with complete dissolved rate and produces excellent effect for the aquarium<br>                                                            Specifications            Outer Diameter:0.63" / 16mmInner Diameter: 0.47" / 12mmWeight: 2.79 oz / 79 gSuitable For:Fresh water &amp; marine tanks                                                            Package Includes            1 x Up aqua CO2 Atomizer system / diffuser 12/16mm