Aquarium CO2 Diffuser Fish Tank Bubble Atomizer Reactor Solenoid Regulator CO2 System Atomizer for Plant with Suction Cup Silver Note: When you first use it, the bubble of the diffuser will be larger because there is a film on the diffuser. After a few days of use, the bubble will become smaller. Please do not use this product for oxygen diffuser unless the oxygen pressure is over 0.2Mpa Description 100% new and high quality Features: 1.Easy for installation. 2.Excellent CO2 dissolve rate. 3.Provide elegant look for your fish tank. Type: carbon dioxide refiner Material: Aluminum alloy Size: 5.5*4cm Diameter of entrance: 5mm Suitable for CO2 tube with inner diameter 4mm Package included: 1pcsx CO2 diffuser Note 1. Due to manual measurement, there is an error of 1-2mm on the product size, I hope you can understand. 2. If you find any problems with the product after receiving it, please contact us in time and we will provide a satisfactory solution.