Feature: 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 Item Type: Aquarium CO2 Atomizer Material: Plastic + Ceramics Color: Black Quantity: 1PCS Suitable Aquarium Using: Approx. Within 40-120cm/15.75-47.24inch Optional Size: S, L Size Suction Cup Diameter Refiner Length(Except Suction Cup) S 2.2cm/0.87inch 5.3cm/2.09inch L 2.7cm/1.06inch 5.5cm/2.17inch . Package List: 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.