Murphy M5081-C Electromechanical Fuel Shutoff Valve part no 55700010

M5081-C: Electromechanical Fuel Shutoff Valve; 2" valve with 2 NPT connections; 2 SPDT snap-switches; CD ignition; aluminum body (55700010)

These fuel shutoff valves are semi-automatic devices for shutdown of natural gas-fueled engines. The valve is opened manually and closes when the electromagnet is energized and trips the latch. The valve can be closed manually by turning the disconnect knob.
A vent in the valve body relieves trapped gas when the valve closes. A pop-out indicator button informs you when the valve is open or closed. The valve’s tripping power is provided by an engine ignition system or battery. 
The M5081 is a 2-inch (51 mm) valve with two NPT connections. It has two SPDT snap-switches.