Inject nutrients, supplements/additives and pH adjusters into irrigation water with ease. No electricity needed. Dosatron is a passive precision fertilizer doser that accurately mixes from the pressure of your incoming water. Operating pressure range is 4.3 -85 PSI and water flow range is 0.05 - 11 GPM. Injection capabilities of 1:1000 to 1:112 (0.1 - 0.9%) [4 ml to 34 ml per gallon]. The unit has 3/4 in NPT connections. Includes mounting bracket, suction hose, bypass, union, weighted strainer, and quick start guide. Mini-maintenance seal kit for Dosatron Dosers - should be replaced on an annual basis.