Aquarium CO2 Generator High Quality DIY Fish for Tank Carbon Dioxide System Kit Carbonated Beverage Preservation Bottle Cap Description: brand new and high quality Features: Carbon dioxide bottle cap homemade CO2 aquatic fish for tank DIY generator. Suitable for all carbonated beverage bottle mouths, regardless of size. For example, Cola, for Sprite, for Fanta, Qixi, Mei Nida and so on. (Please note that juice bottles and mineral water bottles must not be used) The special sealing ring for the cap is made of imported silica gel, which is resistant to acid and alkali. Specification: Type: Carbon Dioxide Generator Material: PC polyester Applications: Aquarium Fish for Tank Adjust Carbonated Beverage Preservation Features: Carbon Dioxide Generator, Aquarium CO2 Generator, Preservation Bottle Cap, for Tank Regulator Accessories Dimension: app.3.5cm/1.38in Color: White Quantity: 1 Pc Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Pc x Carbon Dioxide Generator