The ASCO P159A111X1X01F0 Fast Open On/Off Actuator is a control actuator designed to provide rapid, reliable operation of compatible HVAC valves and gas-control equipment. It converts an electrical control signal into mechanical movement, quickly opening or closing the connected valve as required. Used in compatible boilers, furnaces, burners, and commercial heating systems, this actu... https://www.partshnc.com/p159a111x1x01f0-asco-actuator-fast-open-on-off-1-2-npt-120v