ITEM NAME:Integrated Check Valve 3 In 1 Carbon Dioxide Diffuser For Aquarium Plants Description: Has check valve,bubble counter and diffuser 3 in 1 function. Add water before use.Bring suction cup,easy to disassemble. High molecular PE ceramic atomizing tube,efficient diffusing. Connect the diffuser to the outlet pipe co2 through the outlet pipe to the tank. Use for fresh water or seawater,suitable for 12/16mm,16/22mm,19/25mm diameter water tube. Specification: Material:Plastic Size(LWH):Approx.9x5x12.5cm/3.54x1.97x4.92 inch Package Includes: 1 Set Aquarium Co2 Tool Note: Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. Due to the lighting effects, monitor settings, etc. There could be some slight difference in the color tone of the pictures and the actual item. SKU: ALU0028930564020902.Has check valve,bubble counter and diffuser 3 in 1 function. Connect the diffuser to the outlet pipe co2 through the outlet pipe to the tank. 1 Set Aquarium Co2 Tool. High molecular PE ceramic atomizing tube,efficient diffusing.