CO? Diffuser - 3 in 1It is practical diffusers available，3 function in one unit: CO? Bubble counter， Elbow and Refining the atomizer.Produces bubbles as small as a mist of CO?， generating maximum possible diffusion on CO? in the aquarium.Undisputable quality and reliability.Easy to install.Size: approx 37.2mm*26.4mmThickness: approx 6mm(as the picture shown)Material:GlassPackage included:1 x CO? Diffuser