?CO2 Generator?: DIY CO2 Generator System Kit is used to create pure CO2 constantly by chemical reactions, provide your aquarium plants an abundant CO2 for better growing environment ?Professional Pressure Guage?: Engineering plastic cover with locking pipe device to ensure non-deformation, non-loose, non-slip wire when working; Equipped with pressure gauge for convenient pressure display ?Easy to Use?: Package includes 1 x Pressure gauge, 2 x Bottle Caps, 1 x Needle Valve and Tubes for easy installation, please make sure carefully observe the direction of the parts before assembly ?Note?: 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't suddenly turn up, after immediately shut down again, so as not to cause abnormal pressure to the bottle ?Customer Service?: We will always stand behind our product. If you have any problem about this CO2 Generator System Kit for Aquarium Plant, please feel free to contact us, we will solve it for you in the first time