Description: High Quality Materials: fish tank CO2 diffuser is made of clear acrylic material, which is strong and durable, has no effects on water quality and fish, and can be used with confidence. Transparent: This Carbon Dioxide Refiner makes easily observe the output of carbon dioxide, which is convenient, practical and beautiful. CO2 Diffuser Refiner: fish tank CO2 diffuser has good air output, high dissolution rate and is more practical. Upgraded Refinement Disc: Thinner refinement disc, higher density, increased diffusion area, better refinement effect. Improve the bottom air intake: the bottom air intake is changed to the side air intake, and the flat bottom design is more harmonious and beautiful as a whole. Specification: Material: Acrylic Size Chart: S  Applicable fish tank size: 40-60cm/15.75-23.62inch M Applicable fish tank size: 80-100cm/31.50-39.37inch L  Applicable fish tank size: 120-150cm/47.24-59.06inch Package Includes: 1 Piece Fish Tank CO2 Diffuser Note: Please allow slightly errors due to manual measurement and different monitors.