Uxcell Fish Aquarium Compact Glass CO2 Diffuser, 4mm Inlet Diameter, Clear Product Name : Aquarium CO2 Diffuser; Use for : Aquarium, Fish Tank Color : Clear, Blue, Black; Material : Glass Inlet Diameter (Outside) : 4mm/0.16" ; Outlet Diameter (Inside) : 15mm/0.6" Overall Size : 85 x 90 x 70mm/2.5" x 1.2" x 0.8"(H*W*D); Net Weight : 78 Package Contents : 1 x Aquarium CO2 Diffuser