?This is Aquarium Fish Tank Co2 Atomizer System / Diffuser 16/22mm. 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            Easy to setup and useSafely-NutsR system designed for locking trachea and water pipes effectively to prevent accidental looseningSpray of CO2 and save the amount of CO2， producing excellent effect for the aquariumLightweight design and save the space of tankFor fresh water &amp; marine tanks                                                            Specifications            Dimensions: 4.13 x 2.76 x 1.77" / 10.5 x 7 x 4.5 cm (L x W x H)Weight: 2.89 oz / 82 gColor: BlackOuter Diameter: 22mmInner Diameter: 16mm                                                            Package Includes            1 x Up aqua CO2 Atomizer system / diffuser 16/22mm