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Flow Switch (30)
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McDonnell & Miller

McDonnell & Miller
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Product Image of 260-1-1/2-30, Relief Valve 1-1/2 NPT, 30 psi (2.1 kg/cm2)
260-1-1/2-30, Relief Valve 1-1/2 NPT, 30 psi (2.1 kg/cm2)
SKU: 182625
McDonnell & Miller
SKU: 182625
Brand: McDonnell & Miller
$948.04 each
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Product Image of 260-1-1/2-40, Relief Valve 1-1/2" NPT, 40 psi (2.8 kg/cm2)
260-1-1/2-40, Relief Valve 1-1/2" NPT, 40 psi (2.8 kg/cm2)
SKU: 182730
McDonnell & Miller
SKU: 182730
Brand: McDonnell & Miller
$1,038.09 each
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Product Image of 260-1-1/2-50, Relief Valve 1-1/2 NPT, 50 psi (3.5 kg/cm2)
260-1-1/2-50, Relief Valve 1-1/2 NPT, 50 psi (3.5 kg/cm2)
SKU: 182925
McDonnell & Miller
SKU: 182925
Brand: McDonnell & Miller
$960.75 each
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Product Image of 157S-A-M, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Alternate Tappings,w/ Manual reset (Steam)
157S-A-M, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Alternate Tappings,w/ Manual reset (Steam)
SKU: 172811
McDonnell & Miller
SKU: 172811
Brand: McDonnell & Miller
$1,803.34 each
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Product Image of 157S-RB-M, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Manual Reset
157S-RB-M, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Manual Reset
SKU: 172814
McDonnell & Miller
SKU: 172814
Brand: McDonnell & Miller
$1,621.50 each
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Product Image of 158S-M-HD, Head Assembly for 158S Low Water Cutoff, w/ Manual Reset
158S-M-HD, Head Assembly for 158S Low Water Cutoff, w/ Manual Reset
SKU: 172821
McDonnell & Miller
SKU: 172821
Brand: McDonnell & Miller
$1,295.50 each
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Product Image of 37A-130, Float for 847 & 851
37A-130, Float for 847 & 851
SKU: 313600
McDonnell & Miller
SKU: 313600
Brand: McDonnell & Miller
$530.00 each
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Product Image of 47-171, Dirt Pocket Cap for 47, 247
47-171, Dirt Pocket Cap for 47, 247
SKU: 315450
McDonnell & Miller
SKU: 315450
Brand: McDonnell & Miller
$42.50 each
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Product Image of 51S-114, Seat for 51S
51S-114, Seat for 51S
SKU: 316200
McDonnell & Miller
SKU: 316200
Brand: McDonnell & Miller
$98.67 each
In Stock
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Product Image of FLT-53-05, Float Assembly for 53 Water Feeder
FLT-53-05, Float Assembly for 53 Water Feeder
SKU: 310438
McDonnell & Miller
SKU: 310438
Brand: McDonnell & Miller
$950.00 each
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Product Image of BA-551-05, Bellows Assembly for 551 Water Feeder
BA-551-05, Bellows Assembly for 551 Water Feeder
SKU: 310442
McDonnell & Miller
SKU: 310442
Brand: McDonnell & Miller
$468.78 each
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Product Image of SA2-7, Switch Cover Replacement
SA2-7, Switch Cover Replacement
SKU: 308050
McDonnell & Miller
SKU: 308050
Brand: McDonnell & Miller
$327.17 each
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Product Image of 51S-2-HD, Head Mechanism for Make-Up Water Feeder w/ LWCO Function
51S-2-HD, Head Mechanism for Make-Up Water Feeder w/ LWCO Function
SKU: 136200-MCDONNELL
McDonnell & Miller
SKU: 136200-MCDONNELL
Brand: McDonnell & Miller
$2,055.00 each
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Product Image of 93-M-HD, Head Mechanism for 93 & 193 Series Combination Low Water Cutoff/Pump Controllers
93-M-HD, Head Mechanism for 93 & 193 Series Combination Low Water Cutoff/Pump Controllers
SKU: 162600
McDonnell & Miller
SKU: 162600
Brand: McDonnell & Miller
$2,255.00 each
In Stock
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Product Image of 269, Float Type Low Water Cut-off, 2-1/4" Insertion (Steam)
269, Float Type Low Water Cut-off, 2-1/4" Insertion (Steam)
SKU: 155200
McDonnell & Miller
SKU: 155200
Brand: McDonnell & Miller
$462.63 each
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Product Image of FS7-4WL, 1-1/4" Flow Switch w/ NEMA 4X enclosure, w/extended paddle & paddle arm
FS7-4WL, 1-1/4" Flow Switch w/ NEMA 4X enclosure, w/extended paddle & paddle arm
SKU: 120301
McDonnell & Miller
SKU: 120301
Brand: McDonnell & Miller
$653.55 each
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Product Image of AF1-S-122, Stainless Steel Paddle for Air Flow Switches
AF1-S-122, Stainless Steel Paddle for Air Flow Switches
SKU: 336050
McDonnell & Miller
SKU: 336050
Brand: McDonnell & Miller
$71.75 each
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Product Image of FS4- 3J, 1" Flow Switch w/ BSPT connections
FS4- 3J, 1" Flow Switch w/ BSPT connections
SKU: 114610
McDonnell & Miller
SKU: 114610
Brand: McDonnell & Miller
$217.43 each
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Product Image of FS5-D-3/4, 3/4 Flow Switch w/2 SPDT switches
FS5-D-3/4, 3/4 Flow Switch w/2 SPDT switches
SKU: 114763
McDonnell & Miller
SKU: 114763
Brand: McDonnell & Miller
$406.45 each
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Product Image of FS4-3T2-1, 1" Flow Switch w/ NPT body (Medium Flow Rate)
FS4-3T2-1, 1" Flow Switch w/ NPT body (Medium Flow Rate)
SKU: 115200
McDonnell & Miller
SKU: 115200
Brand: McDonnell & Miller
$303.03 each
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Product Image of AF2-122, Paddle Kit for AF2
AF2-122, Paddle Kit for AF2
SKU: 301400
McDonnell & Miller
SKU: 301400
Brand: McDonnell & Miller
$38.82 each
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Product Image of FS7-31, Replacement Snap Switch for Flow Switch
FS7-31, Replacement Snap Switch for Flow Switch
SKU: 307000
McDonnell & Miller
SKU: 307000
Brand: McDonnell & Miller
$191.36 each
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Product Image of FS7W-43, Replacement Gasket for Flow Switch
FS7W-43, Replacement Gasket for Flow Switch
SKU: 307200
McDonnell & Miller
SKU: 307200
Brand: McDonnell & Miller
$78.00 each
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Product Image of 159S-HD, Head Assembly for Combination Low Water Cutoff & Pump Controller w/ 2 SPST switches
159S-HD, Head Assembly for Combination Low Water Cutoff & Pump Controller w/ 2 SPST switches
SKU: 178902
McDonnell & Miller
SKU: 178902
Brand: McDonnell & Miller
$1,437.36 each
In Stock
Get 3 by Mon, Jun 8
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Product Image of 27T-9, Nipple replacement for 27
27T-9, Nipple replacement for 27
SKU: 311900
McDonnell & Miller
SKU: 311900
Brand: McDonnell & Miller
$86.77 each
In Stock
Get 1 by Mon, Jun 8
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Product Image of 27T-13, Gasket replacement for 27
27T-13, Gasket replacement for 27
SKU: 312100
McDonnell & Miller
SKU: 312100
Brand: McDonnell & Miller
$11.94 each
In Stock
Get 9 by Mon, Jun 8
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Product Image of 421-30, Float Replacement less rod for 25A, 27W
421-30, Float Replacement less rod for 25A, 27W
SKU: 334100
McDonnell & Miller
SKU: 334100
Brand: McDonnell & Miller
$395.95 each
In Stock
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Product Image of FS4-3COV, Replacement Cover for Flow Switch
FS4-3COV, Replacement Cover for Flow Switch
SKU: 304400
McDonnell & Miller
SKU: 304400
Brand: McDonnell & Miller
$23.87 each
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Product Image of FS1/6W-GSKT, Gasket for FS1-FS6W Flow Switch
FS1/6W-GSKT, Gasket for FS1-FS6W Flow Switch
SKU: 300311
McDonnell & Miller
SKU: 300311
Brand: McDonnell & Miller
$87.00 each
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Product Image of 21-3, Valve Bracket for 21
21-3, Valve Bracket for 21
SKU: 310600
McDonnell & Miller
SKU: 310600
Brand: McDonnell & Miller
$157.19 each
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Product Image of GSKT-FS254, Gasket for FS254
GSKT-FS254, Gasket for FS254
SKU: 310801
McDonnell & Miller
SKU: 310801
Brand: McDonnell & Miller
$12.52 each
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Product Image of 21-109, Replacement Connector for 21
21-109, Replacement Connector for 21
SKU: 311400
McDonnell & Miller
SKU: 311400
Brand: McDonnell & Miller
$41.02 each
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Product Image of FS7-4SE, 1-1/4" Flow Switch w/ Stainless Steel Body, w/ NEMA 7 & 9 enclosure
FS7-4SE, 1-1/4" Flow Switch w/ Stainless Steel Body, w/ NEMA 7 & 9 enclosure
SKU: 120175
McDonnell & Miller
SKU: 120175
Brand: McDonnell & Miller
$1,081.06 each
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Product Image of 53, Mechanical Water Feeder
53, Mechanical Water Feeder
SKU: 136900
McDonnell & Miller
SKU: 136900
Brand: McDonnell & Miller
$1,801.70 each
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Product Image of 53-2-HD, Head Replacement for Mechanical Water Feeder
53-2-HD, Head Replacement for Mechanical Water Feeder
SKU: 137300
McDonnell & Miller
SKU: 137300
Brand: McDonnell & Miller
$1,829.72 each
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Product Image of 53-B, Mechanical Water Feeder w/ Float Block
53-B, Mechanical Water Feeder w/ Float Block
SKU: 137400
McDonnell & Miller
SKU: 137400
Brand: McDonnell & Miller
$1,904.44 each
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Product Image of 193-A-7B-M, Combo Low Water Cut-Off & Pump Controller w/ Alternate Tappings,#7B Switch , w/ Manual Reset (Steam)
193-A-7B-M, Combo Low Water Cut-Off & Pump Controller w/ Alternate Tappings,#7B Switch , w/ Manual Reset (Steam)
SKU: 164600
McDonnell & Miller
SKU: 164600
Brand: McDonnell & Miller
$3,844.53 each
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Product Image of 193-B-7B, Combo Low Water Cut-Off & Pump Controller w/ #7B Switch w/ Alternate Tappings (Steam)
193-B-7B, Combo Low Water Cut-Off & Pump Controller w/ #7B Switch w/ Alternate Tappings (Steam)
SKU: 164700
McDonnell & Miller
SKU: 164700
Brand: McDonnell & Miller
$3,244.90 each
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Product Image of 194-A-7B, Combo Low Water Cut-Off and Pump Controllers w/ Alternate Tappings, w/ No. 7B Switch (Steam)
194-A-7B, Combo Low Water Cut-Off and Pump Controllers w/ Alternate Tappings, w/ No. 7B Switch (Steam)
SKU: 167100
McDonnell & Miller
SKU: 167100
Brand: McDonnell & Miller
$3,965.72 each
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Product Image of 194-7B-M, Combo Low Water Cut-Off and Pump Controllers w/ No. 7B Switch, w/ Manual Reset (Steam)
194-7B-M, Combo Low Water Cut-Off and Pump Controllers w/ No. 7B Switch, w/ Manual Reset (Steam)
SKU: 167300
McDonnell & Miller
SKU: 167300
Brand: McDonnell & Miller
$3,803.17 each
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Product Image of 63-B Low Water Cutoff w/ Float Block (Steam or Water)
63-B Low Water Cutoff w/ Float Block (Steam or Water)
SKU: 142700
McDonnell & Miller
SKU: 142700
Brand: McDonnell & Miller
$962.07 each
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Product Image of 150S-M-MD, Float Type, Combo LWCO & Pump Controller, w/ Manual Reset, w/ Maximum Differential (Steam)
150S-M-MD, Float Type, Combo LWCO & Pump Controller, w/ Manual Reset, w/ Maximum Differential (Steam)
SKU: 172807
McDonnell & Miller
SKU: 172807
Brand: McDonnell & Miller
$1,003.52 each
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Product Image of 157S-RL-M, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Alternate Tappings and Manual Reset
157S-RL-M, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Alternate Tappings and Manual Reset
SKU: 172815
McDonnell & Miller
SKU: 172815
Brand: McDonnell & Miller
$2,034.56 each
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Product Image of 157S-R-M, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Alternate Tappings and Manual Reset
157S-R-M, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Alternate Tappings and Manual Reset
SKU: 172817
McDonnell & Miller
SKU: 172817
Brand: McDonnell & Miller
$2,113.63 each
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Product Image of 250-1-45, Relief Valve 1" NPT, 45 psi (3.2 kg/cm2)
250-1-45, Relief Valve 1" NPT, 45 psi (3.2 kg/cm2)
SKU: 182125
McDonnell & Miller
SKU: 182125
Brand: McDonnell & Miller
$254.48 each
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Product Image of 250-2-36, Relief Valve 2" NPT, 36 psi (2.5 kg/cm2)
250-2-36, Relief Valve 2" NPT, 36 psi (2.5 kg/cm2)
SKU: 183125
McDonnell & Miller
SKU: 183125
Brand: McDonnell & Miller
$1,103.29 each
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Product Image of 250-2-50, Relief Valve 2" NPT, 50 psi (3.5 kg/cm2)
250-2-50, Relief Valve 2" NPT, 50 psi (3.5 kg/cm2)
SKU: 183325
McDonnell & Miller
SKU: 183325
Brand: McDonnell & Miller
$1,103.29 each
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Product Image of FS4-3DS, 1" Flow Switch w/Stainless Steel Body and 2 SPDT switches
FS4-3DS, 1" Flow Switch w/Stainless Steel Body and 2 SPDT switches
SKU: 114642
McDonnell & Miller
SKU: 114642
Brand: McDonnell & Miller
$684.08 each
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For over 80 years, McDonnell & Miller has been an industry leader in the engineering and manufacturing of flow switches, low water cut-offs, water feeders, etc. Trust McDonnell & Miller for everything you need to move water.
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