uxcell Aquarium Maintance Clear Glass CO2 Diffuser w Sucker Product Name : Aquarium CO2 Diffuser;Use for : Aquarium, Fish Tank Color : Clear;Material : Glass Inlet Dia : 4.5mm/ 0.18";Outlet Dia : 20mm/ 0.8" Overall Size : 35 x 20 x 25mm/ 1.4" x 0.8" x 1"(L*W*T);Suction Cup Dia. : 2cm/ 0.79" Net Weight : 10g;Package Contents : 1 x Aquarium CO2 Diffuser,1 x Suction Cup