Atman Atomizer System Features: Easy Setup & Use Newly Safely-NutsR system desgined for lock on the Co2 Tube and water tube and you wouldnot worry the tube loose off by pressure or graviation It's adopt Reverse Osmosis (RO) Technology that can diffuse 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 For Fresh and Marine Tank use 3in1 Bubble Counter / Check Valve Specification to suit hoses types: 8/12mm 12/16mm 16/22mm