Mcdonnell & Miller SPDT Flow Switch FS4-3

For starting or stopping electrically operated equipment such as signal lights, alarms, motors, automatic burners, metering devices and others 1" NPT Minimum/maximum temperature: 32 degrees F/300 degrees F Sensitivity adjusting screw makes flow adjustment easy Four stainless steel paddles included: 1", 2", 3" & 6" 25, 50, 80, & 150mm