Fish Care Products -Stainless Steel Co2 Diffuser Carbon Dioxide Spray Reactor Dia.3.6cm-25cm Description: High quality polished stainless steel CO2 diffuser, durable and also stylish, adding a beautiful scenery to your aquarium. 2 sizes of bottom diameter: 3.6cm/1.41"" and 2.4cm/0.94"", 5 length available (20cm/7.87", 25cm/9.8", 30cm / 11.8", 35cm / 13.8", 40cm / 15.7") to meet your needs. Helps ensure plants receive adequate amounts of CO2, improving the growth and health of your plants with adequate supply of CO2. The CO2 diffuser disc should be screwed on as tight as possible during installation. Important: The CO2 diffuser may release large CO2 bubbles in its first 1-3 days of use. When the ceramic disc becomes saturated with water, it will then release fine bubbles of CO2, which is normal and may take up to 3 days. Specification: Material: 304 Stainless Steel CO2 Diffuser Bottom Diameter: 3.6cm/1.41inch; 2.4cm/0.94inch CO2 Diffuser Length: 20cm/7.87inch; 25cm/9.8inch, 30cm/11.8inch, 35cm/13.8inch, 40cm/15.7inch Package includes: 1 Piece CO2 Diffuser Note: Since the above size is measured by hand, the actual item size could be slightly different from above size. Due to lighting effects, monitor settings etc.There could be some slight difference in the color tone of the pictures and the actual item.