For starting or stopping electrically operated equipment such as signal lights, alarms, motors, automatic burners, metering devices and others, In-line configuration eliminates need for a pipe tee, Paddles available for low, medium or high flow, Two electrical knock-outs allows connection from either end, Sensitivity adjusting screw makes flow adjustment easy, Single pole, double throw snap switch, Hardened stainless steel bearings minimize friction, Sealed Monel bellows, Minimum temperature (fluid or ambient) 32°F (0°C)