Features: 1.Using precision ceramic tube, let CO2 full dissolved in water, supply water grass absorption and utilization. 2.Nut locking tooth designed, can safely lock the air pipe. 3.Atomizer shall used in conjunction with water plant meter with working pressure of 2kg or cm2 or above. 4.Made of materials, sturdy, durable and long service life. 5.Two sizes for you to choose, to meet different needs and requirements. Specification: Condition: Item Type: Aquarium CO2 Atomizer Material: Plastic and Ceramics Color: Black Quantity: 1PCS Suitable Aquarium Using: Approx. Within 40-120cm or 15.75-47.24inch Optional Size: S, L SizeSuction Cup DiameterRefiner Length(Except Suction Cup) S2.2cm or 0.87inch5.3cm or 2.09inch L2.7cm or 1.06inch5.5cm or 2.17inch PackageList: 1 x Aquarium CO2 Atomizer Note 1. Due to the large working pressure required, please adjust the air volume from small to large pressure and the micro-adjustment switch from small to large, be sure to pay attention to the slow (if you suddenly and rapidly pressurize or increase the air volume, it is very likely that the atomization will break). 2. The self-made biogenic co2 device cannot achieve the pressure required for the work of this product, so this product cannot be used. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.