McDonnell & Miller model number FS1-G is a 120 volt, single pole, double throw, snap liquid flow switch with gold plated contacts for high sensitivity requirements on low to moderate flow rates such as air conditioning, heating, and hydronic systems.

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McDonnell & Miller model number FS1-W is a 120 volt, single pole, double throw, snap liquid flow switch for high sensitivity requirements on low to moderate flow rates such as air conditioning, heating, and hydronic systems.

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McDonnell & Miller model number FS1 is a 120 volt, single pole, double throw, snap liquid flow switch for high sensitivity requirements on low to moderate flow rates such as air conditioning, heating, and hydronic systems.

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McDonnell & Miller model number FS251 is a 120 volt, single pole, double throw, snap liquid flow switch for starting and stopping electrical equipment such as alarms, motors, and automatic burners.

McDonnell & Miller model number FS254 is a 120 volt, single pole, double throw, snap liquid flow switch for starting and stopping electrical equipment such as alarms, motors, and automatic burners.

McDonnell & Miller model number FS4-3RP-T is a 120 volt, single pole, double throw, snap liquid flow switch for universal general purpose applications for starting and stopping electrical operation equipment such as signals, alarms, motors, automatic burners, and metering devices.

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McDonnell & Miller model number FS4-3S is a 120 volt, single pole, double throw, snap liquid flow switch for universal general purpose applications for starting and stopping electrical operation equipment such as signals, alarms, motors, automatic burners, and metering devices.

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McDonnell & Miller model number FS4-3D is a 120 volt, double pole, double throw, snap liquid flow switch for universal general purpose applications for starting and stopping electrical operation equipment such as signals, alarms, motors, automatic burners, and metering devices.

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McDonnell & Miller model number FS4-3-DS is a 120 volt, double pole, double throw, snap liquid flow switch for universal general purpose applications for starting and stopping electrical operation equipment such as signals, alarms, motors, automatic burners, and metering devices.

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McDonnell & Miller model number FS4-3T is a 120 volt, single pole, double throw, snap liquid flow switch for universal general purpose applications for starting and stopping electrical operation equipment such as signals, alarms, motors, automatic burners, and metering devices.

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McDonnell & Miller model number FS4-3T1-1 is a 120 volt, single pole, double throw, snap liquid flow switch for universal general purpose applications for starting and stopping electrical operation equipment such as signals, alarms, motors, automatic burners, and metering devices.

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McDonnell & Miller model number FS4-3T2-3/4" is a 120 volt, single pole, double throw, snap liquid flow switch for universal general purpose applications for starting and stopping electrical operation equipment such as signals, alarms, motors, automatic burners, and metering devices.

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McDonnell & Miller model number FS4-3T2-1" is a 120 volt, single pole, double throw, snap liquid flow switch for universal general purpose applications for starting and stopping electrical operation equipment such as signals, alarms, motors, automatic burners, and metering devices.

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McDonnell & Miller model number FS4-3T3-1" is a 120 volt, single pole, double throw, snap liquid flow switch for universal general purpose applications for starting and stopping electrical operation equipment such as signals, alarms, motors, automatic burners, and metering devices.

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McDonnell & Miller model number FS4-3T3 is a 120 volt, single pole, double throw, snap liquid flow switch for universal general purpose applications for starting and stopping electrical operation equipment such as signals, alarms, motors, automatic burners, and metering devices.

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McDonnell & Miller model number FS5-3/4" is a 120 volt, single pole, double throw, snap liquid flow switch for general purpose applications requiring low flow rate sensitivity.

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McDonnell & Miller model number FS5-1" is a 120 volt, single pole, double throw, snap liquid flow switch for general purpose applications requiring low flow rate sensitivity.

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McDonnell & Miller FS5-DS-1" model number is a stainless steel 120 volt, single pole, double throw, snap liquid flow switch for general purpose applications requiring low flow rate sensitivity.

McDonnell & Miller model number FS5-S-1" is a stainless steel 120 volt, single pole, double throw, snap liquid flow switch for general purpose applications requiring low flow rate sensitivity.

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McDonnell & Miller model number FS5D-3/4" is a 120 volt, double pole, double throw, snap liquid flow switch for general purpose applications requiring low flow rate sensitivity.

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McDonnell & Miller model number FS5D-1" is a 120 volt, double pole, double throw, snap liquid flow switch for general purpose applications requiring low flow rate sensitivity.

McDonnell & Miller model number FS6-3/4" is a 120 volt, single pole, double throw, snap liquid flow switch for heavy duty applications where high sensitivity is required and there are very high flow rates such as water treatment systems and compressors, as well as, booster pumps that require instant switching.

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McDonnell & Miller model number FS6-1" is a 120 volt, single pole, double throw, snap liquid flow switch for heavy duty applications where high sensitivity is required and there are very high flow rates such as water treatment systems and compressors, as well as, booster pumps that require instant switching.

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McDonnell & Miller model number FS6-W-3/4" is a 120 volt, NEMA 4X, single pole, double throw, snap liquid flow switch for heavy duty applications where high sensitivity is required and there are very high flow rates such as water treatment systems and compressors, as well as, booster pumps that require instant switching.

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McDonnell & Miller model number FS6-W-1" is a 120 volt, NEMA 4X, single pole, double throw, snap liquid flow switch for heavy duty applications where high sensitivity is required and there are very high flow rates such as water treatment systems and compressors, as well as, booster pumps that require instant switching.

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McDonnell & Miller model number FS7-4 is a 120 volt, single pole, double throw, snap liquid flow switch for universal industrial large pipe applications such as heating and hydronic systems, air conditioning refrigeration, and process work.

McDonnell & Miller model number FS7-4D-1-1/4" is a 120 volt, double pole, double throw, snap liquid flow switch for universal industrial large pipe applications such as heating and hydronic systems, air conditioning refrigeration, and process work.

McDonnell & Miller model number FS7-4DS-1-1/4" is a stainless steel 120 volt, double pole, double throw, snap liquid flow switch for universal industrial large pipe applications such as heating and hydronic systems, air conditioning refrigeration, and process work.

McDonnell & Miller model number FS7-4EL-1-1/4" is a 120 volt, NEMA 4X, single pole, double throw, snap liquid flow switch for hazardous environment applications.

McDonnell & Miller model number FS7-4W is a 120 volt, NEMA 4X, single pole, double throw, snap liquid flow switch for applications required to be water tight and dust tight.

McDonnell & Miller model number FS7-4E is a 120 volt, NEMA 7 or 9, single pole, double throw, snap liquid flow switch for hazardous environment applications.

McDonnell & Miller model number FS7-4L is a 120 volt, single pole, double throw, snap liquid flow switch for universal industrial large pipe applications such as heating and hydronic systems, air conditioning refrigeration, and process work.

McDonnell & Miller model number FS7-4S-1-1/4" is a stainless steel 120 volt, single pole, double throw, snap liquid flow switch for universal industrial large pipe applications such as heating and hydronic systems, air conditioning refrigeration, and process work.

McDonnell & Miller model number FS7-4SE-1-1/4" is a stainless steel 120 volt, NEMA 7 or 9, single pole, double throw, snap liquid flow switch for hazardous environment applications.

McDonnell & Miller model number FS7-4SW-1-1/4" is a stainless steel 120 volt, NEMA 4X, single pole, double throw, snap liquid flow switch for applications required to be water tight and dust tight.

McDonnell & Miller model number FS8-WG-1" is a 120 volt, NEMA 4X, single pole, double throw, snap liquid flow switch with gold-plated contacts for applications required to be water tight and dust tight.

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McDonnell & Miller model number FS8-WG-SL-1" is a 120 volt, NEMA 4X, single pole, double throw, snap liquid flow switch with gold-plated contacts for applications required to be water tight and dust tight.

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McDonnell & Miller model number FS7-4WL is a 120 volt, NEMA 4X, single pole, double throw, snap liquid flow switch for applications required to be water tight and dust tight.

McDonnell & Miller model number FS7-WZ-1" is a 120 volt, NEMA 4X, single pole, double throw, snap liquid flow switch with ANSI terminals for applications required to be water tight and dust tight.

McDonnell & Miller model number FS4-3 is a 1" NPT, 120 volt, single pole, double throw, snap liquid flow switch for universal general purpose applications for starting and stopping electrical operation equipment such as signals, alarms, motors, automatic burners, and metering devices.

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McDonnell & Miller 1" NPT, NEMA 4X-rated, single pole, double throw snap flow switch with sealed Monel bellows. This switch comes with four stainless steel paddles in 1", 2", 3", and 6".

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Dwyer Instruments Series V6 FlotecT mini-size 1/2" SPDT low flow switch for monitoring liquid, gas, or air flows. This switch is explosion-proof with a brass upper and lower body.

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Johnson Controls standard model flow switch with Type 3R (NEMA) enclosure. This switch comes with 1", 2", 3", and 6" stainless steel paddles, lock-tooth washer, and stainless steel paddle screw.

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Warrick 3/8" MPT compact flow switch for high in-line pressures. This switch as a flow rate setting of 0.15-2 GPM.