In- Transparent Acrylic Aquarium CO2 System Diffuser U-tubes Mini Diffuser CO2 Refiner Regulator with Ceramic Disc Suction Cups Features: 1,Create rich CO2 to provide aquarium plants with the carbon dioxide they need and ensure the nutrition and health of hydrophytes. 2,The CO2 diffuser will supply aquarium plants a friendly living environment. 3,The ceramic diffuser disc of this co2 diffuser has atomic pores on its surface, which can produce fine bubbles that rise slowly and ensure efficient diffusion of carbon dioxide in the aquarium. 4,With the suction cup(included), it is easy to install and operate the co2 diffuser and can fix on the aquarium firmly. Specification: Material:Acrylic and ceramic disc Color:Transparent Size:S/M/L S:85X40X14mm , M:76X46X18mm,L:80X50X24mm Packageincluded: 1pc x CO2 diffuser with ceramic discs 1pc x suction cup Instructions: 1. Connect the refiner and the CO2 decompression gauge with a special trachea, and place it in the center of the fish tank. 2. Before connecting the thinner to the trachea, pour water into the thinner elbow. After connecting the trachea, push the water into the thinner cavity by air pressure, so as to realize the bubble recording function. 3. Slowly open the fine-tuning switch of the carbon dioxide pressure reducing valve, confirm the amount of carbon dioxide added by the bubbling speed in the refiner cavity, and adjust the appropriately according to the size of the fish tank. 4.Statement: Dear friends, you ca n't blow with your mouth, please do n't blow with your mouth to test whether it is blocked, this is not blocked, not blocked, not blocked, as long as the pressure is reached, the bubbles can be produced. Note: Duetothehandmeasurement,therehavesizeerrorabout1-5mm Itemcolordisplayedinphotosmaybeshowingslightlydifferentonyourcomputermonitorsincemonitorsarenotcalibratedsame.