package include : 
 pressure gauge*1+bottle cap*2+regulating valve*1+T  3-way jonint*1+air tube 2m

The principle of the device is to produce CO2 by chemical reaction of citric acid and  baking soda.

IMG_20160122_161017IMG_20160122_161224IMG_20160122_161245IMG_20160122_161301IMG_20160122_161328IMG_20160122_161509IMG_20160122_161350

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