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Specification: Hose length: 60 Inch/150cm Working pressure: 5000 PSI Thread For Large CO2 Tank: CGA320 G1/2-14. Instructions: 1.Screw the CGA320 Nut to large CO2 gas cylinder and tighten it by wrench; 2.Remove the black adapter from the quick coupler firstly,and screw it onto the soda machine by wrench,then connect the quick coupler; 3.Open the valve of the large gas bottle; 4.Done,you can enjoy your sparkling water. if you want unscrew the pin valve from the machine: 1.Close valve of the large gas bottle; 2. Press the machine button several times to let the gas out, otherwise the o ring in coupler will be blowed out. 3.Disconnect the quick coupler. Please pay attention:Our unit works with GAS CO2 only, not liquid CO2. liquid CO2 will create a bad taste in your drink.