These new solenoid valves are used in conjunction with our KF10 thru KF50 single acting pneumatic (air actuated valves). The solenoid controls air pressure to open and close the valve. When power is lost the pneumatic valve will automatically close. NPT 1/8 inch, working air pressure range of 116 psi. These solenoid valves operate on an external power source of 110 VAC. See graphic below for wiring instructions.