This water powered doser is directly installed into the water supply line. Dosatron Doser operates by using water pressure as the power source (no electricty 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 - 14 GPM. Injection capabilities of 1:3000 to 1:333 ( 0.03 to 0.3%) [0.384 to 0.0425 ounces per gallon]. Unit has 3/4 in NPT connections. Includes mounting bracket, suction hose, bypass, union, weighted strainer, and quick start guide. This part is special order only.