["brand new and high quality\nFeatures:\nEnsure your beautiful aquarium plants receive a sufficient supply of CO2\nA strong suction cup keeps the tube firmly attached to the glass wall\nHigh efficiency of diffusing carbon dioxide\nGood for guppy, shrimp, and all kinds of aqua creatures.\nPls note this air refiner work together with an air pump(not included), make no noise.\n\nSpecification:\nMaterial: Arcylic\nSize: S,for M,L\nS: Disk diameter:1.2cm/0.47in\nM: Disk diameter: 3.5cm/1.38in\nL: Disk diameter: 6cm/2.36in\nColor: Clear\nQuantity: 1Set\nNote:\n1.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid.\n2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage include:\n1x CO2 Diffuser (No retail package)"]