Dosatron injectors will accurately inject: fertilizers, insecticides, fungicides, algaecides, acids, wetting agents, disinfectants, and sanitizers. Dosatron injectors are non-electric, water powered and piston-driven. Unit operates on positive displacement. Concentrate is directly proportional to volume of water, resulting in high accuracy. D8R - Ratio: 1:500 to 1:50. Pressure: 2 to 110 psi. Pipe size: 1.5 NPT thread. Size: 25.25" x 8.5". Weight 12 lb.