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/cm2 or above. 4.Made of high quality materials, sturdy, durable and long service life. 5.Two sizes for you to choose, to meet different needs and requirements. Specification: Condition: 100% Brand New_x005F_x000D_ Item Type: Aquarium CO2 Atomizer_x005F_x000D_ Material: Plastic + Ceramics_x005F_x000D_ Color: Black_x005F_x000D_ Quantity: 1PCS_x005F_x000D_ Suitable Aquarium Using: Approx. Within 40-120cm/15.75-47.24inch_x005F_x000D_ Optional Size: S, L_x005F_x000D_ _x005F_x000D_ SizeSuction Cup DiameterRefiner Length(Except Suction Cup)_x005F_x000D_ S2.2cm/0.87inch5.3cm/2.09inch_x005F_x000D_ L2.7cm/1.06inch5.5cm/2.17inch PackageList: 1 x_x005F_x000D_ _x005F_x000D_ 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)._x005F_x000D_ 2. The self-made biogenic co2 device cannot achieve the pressure required for the work of this product, so this product cannot be used.