The D022 flag dripper with 2 GPH is a spiral flow pattern dripper that can be twisted to open and cleaned. The flag dripper flow rate will depend on the incoming inlet pressure to the emitter with the nominal flow rated suggested is at a pressure of 15 PSI. The flag drippers work well in small systems with short runs, and on flat terrain. We recommend installing a 15, 19 or 25 PSI pressure regulator on systems using this dripper.