Item Type: CO2 GeneratorCO2 Tube Length: Approx. 1.6m / 5.2ftWhat do you need to prepare for this systems?Below (Not Included)2 x 2 Litre of Coka Cola plastic bottle1 x 200g of Citric acid or 200ml of vinegar1 x 200g of baking sodaTips to Install:The bottle must be carbonated beverage bottle, do not use pulpy, green tea, mineral water bottles, etc.Trimming valve regulation avoid by sudden big or small, can not suddenly turn up, after immediately shut down again, so as not to cause abnormal pressure to the bottle.Note: Make sure carefully observe the direction of the parts before assembly. The usual wrong handle way will cause abnormal response components as follow: the contrary direction of the check valve and fine tuning in the direct..