Category Products

  • SKU: MH1138
  • Obsolete

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.

This item is obsolete. Please visit the item's page to view 1 repair part.

  • SKU: MH1139
  • 2 in stock
  • Ships within 10 business days

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.

Online Price: $241.73
Regular Price: $273.26

  • SKU: MH1140
  • 3 in stock
  • Ships within 10 business days

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.

Online Price: $214.85
Regular Price: $242.87

  • SKU: MH1142
  • 7 in stock
  • Ships within 10 business days

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.

Online Price: $126.60
Regular Price: $143.12

  • SKU: MH1142C
  • Ships within 10 business days

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.

Online Price: $172.65
Regular Price: $195.17

  • SKU: MH1146
  • Ships within 10 business days

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.

Online Price: $176.48
Regular Price: $199.50

  • SKU: MH1146B
  • Ships within 10 business days

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.

Online Price: $406.68
Regular Price: $459.73

  • SKU: MH1148
  • 1 in stock
  • Ships within 10 business days

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.

Online Price: $211.02
Regular Price: $238.54

  • SKU: MH1148A
  • Ships within 10 business days

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.

Online Price: $475.74
Regular Price: $537.80

  • SKU: MH1150
  • Ships within 10 business days

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.

Online Price: $211.02
Regular Price: $238.54

  • SKU: MH1150A
  • Ships within 10 business days

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.

Online Price: $211.02
Regular Price: $238.54

  • SKU: MH1150B
  • 1 in stock
  • Ships within 10 business days

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.

Online Price: $211.02
Regular Price: $238.54

  • SKU: MH1150C
  • Ships within 10 business days

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.

Online Price: $211.02
Regular Price: $238.54

  • SKU: MH1150D
  • 1 in stock
  • Ships within 10 business days

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.

Online Price: $211.02
Regular Price: $238.54

  • SKU: MH1151
  • Ships within 10 business days

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.

Online Price: $211.02
Regular Price: $238.54

  • SKU: MH1155
  • 2 in stock
  • Ships within 10 business days

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.

Online Price: $222.53
Regular Price: $251.55

  • SKU: MH1156
  • 1 in stock
  • Ships within 10 business days

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.

Online Price: $222.53
Regular Price: $251.55

  • SKU: MH1156A
  • Ships within 10 business days

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.

Online Price: $928.45
Regular Price: $1,005.82

  • SKU: MH1156B
  • Ships within 10 business days

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.

Online Price: $882.56
Regular Price: $956.10

  • SKU: MH1157
  • Ships within 10 business days

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.

Online Price: $295.42
Regular Price: $333.95

  • SKU: MH1158
  • Ships within 10 business days

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.

Online Price: $295.42
Regular Price: $333.95

  • SKU: MH1159
  • 2 in stock
  • Ships within 10 business days

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.

Online Price: $333.79
Regular Price: $377.33

  • SKU: MH1160
  • 1 in stock
  • Ships within 10 business days

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.

Online Price: $333.79
Regular Price: $377.33

  • SKU: MH1160A
  • 1 in stock
  • Ships within 10 business days

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.

Online Price: $379.82
Regular Price: $429.36

  • SKU: MH1160B
  • Ships within 10 business days

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.

Online Price: $379.82
Regular Price: $429.36

  • SKU: MH1165
  • 1 in stock
  • Ships within 10 business days

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.

Online Price: $360.64
Regular Price: $407.67

  • SKU: MH1165B
  • Ships within 10 business days

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.

Online Price: $425.87
Regular Price: $481.41

  • SKU: MH1165D
  • Ships within 10 business days

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.

Online Price: $694.42
Regular Price: $752.29

  • SKU: MH1165E
  • Ships within 10 business days

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.

Online Price: $533.28
Regular Price: $602.84

  • SKU: MH1166
  • 1 in stock
  • Ships within 10 business days

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.

Online Price: $437.37
Regular Price: $494.42

  • SKU: MH1167
  • Ships within 10 business days

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.

Online Price: $514.10
Regular Price: $581.15

  • SKU: MH1168
  • 1 in stock
  • Ships within 10 business days

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.

Online Price: $383.67
Regular Price: $433.71

  • SKU: MH1168A
  • Ships within 10 business days

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.

Online Price: $598.51
Regular Price: $648.39

  • SKU: MH1168B
  • Ships within 10 business days

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.

Online Price: $755.80
Regular Price: $818.79

  • SKU: MH1168C
  • Ships within 10 business days

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.

Online Price: $702.10
Regular Price: $760.60

  • SKU: MH1168D
  • Obsolete

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.

This item is obsolete. Please visit the item's page to view 4 repair parts.

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.

This item is obsolete. Please visit the item's page to view 4 repair parts and 2 alternate items.

  • SKU: MH1169
  • Ships within 10 business days

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.

Online Price: $460.39
Regular Price: $520.44

  • SKU: MH1169A
  • Obsolete

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.

This item is obsolete. It is shown for reference purposes only. Please call (877) 775-7705 for repair parts and replacements.

  • SKU: MH1145
  • 10 in stock
  • Ships within 10 business days

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.

Online Price: $130.45
Regular Price: $147.47

  • SKU: MH1170
  • 1 in stock
  • Ships within 10 business days

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".

Online Price: $176.48
Regular Price: $191.19

  • SKU: MH1139A
  • 4 in stock
  • Ships within 1 business day

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.

Online Price: $308.33
Regular Price: $334.02

  • SKU: JC1575
  • 100+ in stock
  • Ships within 1 business day

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.

Online Price: $144.63
Regular Price: $163.30