Identical NPC irrigation drippers are used to assemble a special control dripper called a fractional dripper. The flow rate of a fractional dripper is a fixed fraction of the flow rate of the irrigation drippers used to assemble the fractional dripper, regardless of the pressure. For example, if the control dripper is a fractional dipper with one quarter of the flow rate of an irrigation dripper, then the volume of water discharged by each of the irrigation drippers is 4 times the control volume regardless of the pressure.


The  Fractional Dripper Tool can be used to make a fractional dripper where the drippers are supplied by the user.

Fractional Dripper Tool