Flag drippers function like drip emitters. While they are not pressure compensating, meaning the flow per hour (GPH) will vary according to pressure, they do have flow control, which allows you to adjust them to a wide range of water application rates. This can be especially helpful for adjusting flow according to soil type in order to prevent runoff and for increasing flow as plants mature. They are superior to drip emitters in their ability to handle water with particulate in it. The flag color indicates the GPM of the dripper and is removable for easy cleaning. The 10-32 male thread inlet on the flag dripper connects to a 6- or 12-in. drip stake with 10-32 female thread (FT). Available flows are 1, 2 and 4 gallons per hour (GPH). Recommended operating pressure is 30 PSI. For outdoor irrigation use with cold water only.