Jardin Aquarium Plants Glass Carbon Dioxide Reactor, CO2 Diffuser Product Name : Aquarium CO2 Diffuser; Use for : Aquarium, Fish Tank Color : Clear; Material : Glass, Ceramic Inlet Diameter : 3.8mm/0.15"; Outlet Diameter : 20mm/0.78" Overall Size : 63 x 30 x 20mm/2.5" x 1.2" x 0.8"(L x W x T); Net Weight : 11g Package Contents : 1 x Aquarium CO2 Diffuser