Hydraulic Concentrate Control Valves are designed for use with either a bladder tank system or balance pressure proportioning systems. The valve is used to automatically open the line supplying foam concentrates to a ratio controller. It does not require electrical power to operate only water from a system that has been activated. Available in 1", 1^1/ 4", 1^1/2", 2", 2^1/2", and 3" sizes. Standard brass threaded with optional stainless flanged available. Optional 24V DC, 120V AC, or 220 VAC solenoid options