Features: 1. it adopts precision ceramic tube, which makes CO2 fully dissolved in water, and supplies water for absorption and utilization. 2. The design of nut locking teeth can lock the trachea safely. 3. The atomizer needs to be used with aquatic plants with working pressure of 2kg/cm2 or above. 4. This product is suitable for aquariums within 40-120cm. Specification: Effective atomizing part length: 2.1cm Diameter: 1cm Note: 1. Because the required working pressure is large, please adjust the gas volume from small to large and the fine-tuning switch from small to large, so be careful to be slow. 2. If the pressure is suddenly and increased or the gas volume is increased, it is very likely that the atomization break. 3. Do not play with children, so as to avoid injury and loss. 4. Self-made biogenic carbon dioxide equipment can't reach the pressure required by this product, so this product can't be used. size: Large size: 5.5 x 4 x 3.5cm Material: Plastic + Ceramic colour: As shown Package Contents: 1 x Aquarium Atomizer Diffuser Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.