Liquid Flow Switches

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. Learn More

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. Learn More

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. Learn More

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. Learn More

McDonnell & Miller 120611 Liquid Flow Switch model FS251 with NEMA 1 enclosure, 1" NPTM pipe connection, and four stainless steel paddle options (1", 2", 3", and 6"). Learn More

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. Learn More

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. Learn More

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. Learn More

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. Learn More

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. Learn More

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. Learn More

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. Learn More

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. Learn More

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. Learn More

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. Learn More

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. Learn More

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. Learn More

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. Learn More

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. Learn More

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. Learn More