Dosatron Water Powered Doser 11 GPM 1:500 to 1:50 - 3/4 in (D25RE2VFBPHY) Dosatron water powered doser is directly installed in the water supply line. The Dosatron operates by using water pressure as the power source (no electricity needed). The water activates the Dosatron, which takes up the required percentage of concentrate. Inside the Dosatron, the concentrate is mixed with the water. The water pressure forces the solution downstream. Operating pressure range is 4.3 -85 PSI and water flow range is 0.05 - 11 GPM. Injection capabilities of 1:500 to 1:50 (0.2 to 2%) [0.256 to 2.560 ounces per gallon]. 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.