SNQTV-Specifications:With 2 air-pipe locks on the bottle cap, prevent the air-pipe getting loose.Specialized pressure gauge, so safe area and scale can be seen clearly.You can built up your CO2 system within 15 minutes by using this complete DIY CO2 kit combo for planted aquarium.This bottle cap fits common PET plastic bottle perfectly.Promote plant growing, easy to set up, low cost, safe.Extra Information:1. The bottle have to use carbonated beverage bottle, do not use pulpy, green tea, mineral water bottles, etc.2. Trimming valves regulation avoid by sudden big or small, do not suddenly turn up, after immediately shut down again, so as not to cause abnormal pressure to the bottle.3. Make sure carefully observe the direction of the parts before assembly. The usual wrong handle way will cause abnormal reacts ion components as follow: the contrary direction of the check valves and fine-tuning in the direct.Type: Carbon Dioxide GeneratorModel: D201Material: PlasticFeatures: DIY, Useful, Easy to UseItem Size: 6.30cm x 4.72cm x 1.65cm/6.30 x 4.72 x 1.65 (Approx.)Notes:Due to the light and screen setting difference, the items color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Carbon Dioxide Generator