For Creator Pro, please firstly verify the type of nozzle you have. There are two types of nozzles. Please see specs as below:
Original nozzle : Outer Diameter = 0.275 Inch (Before Jan. 2014)
Updated nozzle: Outer Diameter = 0.35 Inch (After Jan.2014)
Original nozzle matches original teflon tube while upgraded nozzle matches upgraded teflon tube.
For Dreamer, please choose Updated version.