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Flow Switch (30)
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McDonnell & Miller

McDonnell & Miller
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Product Image of 157S-RD-MD, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Maximum Differential
157S-RD-MD, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Maximum Differential
SKU: 176802
McDonnell & Miller
SKU: 176802
Brand: McDonnell & Miller
$2,233.80 each
In Stock
Get 1 by Fri, Jun 12
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Product Image of 751P-MT-120, GuardDog Electronic Manual Reset Low Water Cutoff w/ Probe(Water)
751P-MT-120, GuardDog Electronic Manual Reset Low Water Cutoff w/ Probe(Water)
SKU: 176234
McDonnell & Miller
SKU: 176234
Brand: McDonnell & Miller
(5)
$300.83 each
In Stock
Get 3 by Mon, Jun 15
In Stock
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Product Image of FS7-4SJ, 1-1/4" BPST General Purpose Flow Switch - Paddle Style
FS7-4SJ, 1-1/4" BPST General Purpose Flow Switch - Paddle Style
SKU: 120171
McDonnell & Miller
SKU: 120171
Brand: McDonnell & Miller
$1,631.68 each
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Product Image of 27-W, Liquid Level Control
27-W, Liquid Level Control
SKU: 127200
McDonnell & Miller
SKU: 127200
Brand: McDonnell & Miller
$3,866.63 each
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Product Image of RB-24SE-B, GuardDog Electronic, 24V Low Water Cut-Off w/ Burner Control Harness (Water) (Purple Tubing)
RB-24SE-B, GuardDog Electronic, 24V Low Water Cut-Off w/ Burner Control Harness (Water) (Purple Tubing)
SKU: 144724
McDonnell & Miller
SKU: 144724
Brand: McDonnell & Miller
$157.50 each
Out of Stock
Get it by Wed, Jun 24 - Wed, Jul 1
Out of Stock
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Product Image of 157R158S-HD, Head Replacement for Low Water Cutoff
157R158S-HD, Head Replacement for Low Water Cutoff
SKU: 178001
McDonnell & Miller
SKU: 178001
Brand: McDonnell & Miller
$2,034.17 each
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Product Image of 60" G-5-SS Non-Teflon Ground Probe
60" G-5-SS Non-Teflon Ground Probe
SKU: 179159
McDonnell & Miller
SKU: 179159
Brand: McDonnell & Miller
$72.84 each
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Product Image of 158S-M, Combination Low Water Cutoff & Pump Controller w/ 2 SPDT switches, w/ Manual Reset
158S-M, Combination Low Water Cutoff & Pump Controller w/ 2 SPDT switches, w/ Manual Reset
SKU: 172819
McDonnell & Miller
SKU: 172819
Brand: McDonnell & Miller
$1,406.61 each
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Product Image of FS6-W-1, 1" Flow Switch w/ NEMA 4X enclosure
FS6-W-1, 1" Flow Switch w/ NEMA 4X enclosure
SKU: 115652
McDonnell & Miller
SKU: 115652
Brand: McDonnell & Miller
$545.76 each
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Product Image of 193-B, Combo Low Water Cut-Off & Pump Controller w/ #5 Switch w/ Alternate Tappings (Steam)
193-B, Combo Low Water Cut-Off & Pump Controller w/ #5 Switch w/ Alternate Tappings (Steam)
SKU: 163600
McDonnell & Miller
SKU: 163600
Brand: McDonnell & Miller
$2,708.38 each
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Product Image of 193-D, Combo Low Water Cut-Off & Pump Controller w/ #5 Switch w/ Alternate Tappings (Steam)
193-D, Combo Low Water Cut-Off & Pump Controller w/ #5 Switch w/ Alternate Tappings (Steam)
SKU: 163900
McDonnell & Miller
SKU: 163900
Brand: McDonnell & Miller
$3,401.94 each
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Product Image of 193-B-M, Combo Low Water Cut-Off & Pump Controller w/ #5 Switch, w/ Alternate Tappings, w/ Manual Reset (Steam)
193-B-M, Combo Low Water Cut-Off & Pump Controller w/ #5 Switch, w/ Alternate Tappings, w/ Manual Reset (Steam)
SKU: 164300
McDonnell & Miller
SKU: 164300
Brand: McDonnell & Miller
$3,014.03 each
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Product Image of 193-B-7B-M, Combo Low Water Cut-Off & Pump Controller w/ #7B Switch w/ Alternate Tappings , w/ Manual Reset (Steam)
193-B-7B-M, Combo Low Water Cut-Off & Pump Controller w/ #7B Switch w/ Alternate Tappings , w/ Manual Reset (Steam)
SKU: 164725
McDonnell & Miller
SKU: 164725
Brand: McDonnell & Miller
$3,647.15 each
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Product Image of 194-A, Combo Low Water Cut-Off and Pump Controllers w/ Alternate Tappings (Steam)
194-A, Combo Low Water Cut-Off and Pump Controllers w/ Alternate Tappings (Steam)
SKU: 166700
McDonnell & Miller
SKU: 166700
Brand: McDonnell & Miller
$2,824.47 each
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Product Image of 569, Float Type Low Water Cut-off, 1-3/16" Insertion (Steam)
569, Float Type Low Water Cut-off, 1-3/16" Insertion (Steam)
SKU: 155700
McDonnell & Miller
SKU: 155700
Brand: McDonnell & Miller
$590.00 each
In Stock
Get 1 by Thu, Jun 11
In Stock
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Product Image of 250-3/4-15, Relief Valve 3/4" NPT, 15 psi (1 kg/cm2)
250-3/4-15, Relief Valve 3/4" NPT, 15 psi (1 kg/cm2)
SKU: 181220
McDonnell & Miller
SKU: 181220
Brand: McDonnell & Miller
$155.00 each
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Product Image of 250-1-36, Relief Valve 1" NPT, 36 psi (2.5 kg/cm2)
250-1-36, Relief Valve 1" NPT, 36 psi (2.5 kg/cm2)
SKU: 182025
McDonnell & Miller
SKU: 182025
Brand: McDonnell & Miller
$266.60 each
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Product Image of 250-1-40, Relief Valve 1" NPT, 40 psi (2.8 kg/cm2)
250-1-40, Relief Valve 1" NPT, 40 psi (2.8 kg/cm2)
SKU: 182030
McDonnell & Miller
SKU: 182030
Brand: McDonnell & Miller
$266.60 each
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Product Image of 250-1-65, Relief Valve 1" NPT, 65 psi (4.6 kg/cm2)
250-1-65, Relief Valve 1" NPT, 65 psi (4.6 kg/cm2)
SKU: 182235
McDonnell & Miller
SKU: 182235
Brand: McDonnell & Miller
$251.45 each
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Product Image of 250-1-100, Relief Valve 1" NPT, 100 psi (7 kg/cm2)
250-1-100, Relief Valve 1" NPT, 100 psi (7 kg/cm2)
SKU: 182425
McDonnell & Miller
SKU: 182425
Brand: McDonnell & Miller
$416.48 each
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Product Image of 260-1-1/2-45, Relief Valve 1-1/2" NPT, 45 psi (3.2 kg/cm2)
260-1-1/2-45, Relief Valve 1-1/2" NPT, 45 psi (3.2 kg/cm2)
SKU: 182825
McDonnell & Miller
SKU: 182825
Brand: McDonnell & Miller
$960.75 each
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Product Image of 250-2-30, Relief Valve 2" NPT, 30 psi (2.1 kg/cm2)
250-2-30, Relief Valve 2" NPT, 30 psi (2.1 kg/cm2)
SKU: 183025
McDonnell & Miller
SKU: 183025
Brand: McDonnell & Miller
$994.09 each
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Product Image of 250-2-40, Relief Valve 2" NPT, 40 psi (2.8 kg/cm2)
250-2-40, Relief Valve 2" NPT, 40 psi (2.8 kg/cm2)
SKU: 183175
McDonnell & Miller
SKU: 183175
Brand: McDonnell & Miller
$1,276.66 each
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Product Image of Relief Valve 1" NPT, 30 psi (2.1 kg/cm2)
Relief Valve 1" NPT, 30 psi (2.1 kg/cm2)
SKU: 250-1-30
McDonnell & Miller
SKU: 250-1-30
Brand: McDonnell & Miller
(1)
$122.75 each
In Stock
Get 1 by Thu, Jun 11
In Stock
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Product Image of AF3-122, Paddle Kit for AF3
AF3-122, Paddle Kit for AF3
SKU: 301450
McDonnell & Miller
SKU: 301450
Brand: McDonnell & Miller
$38.50 each
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Product Image of FS1-14, Replacement Gasket for FS1
FS1-14, Replacement Gasket for FS1
SKU: 304290
McDonnell & Miller
SKU: 304290
Brand: McDonnell & Miller
$20.42 each
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Product Image of SA47C-101-102, Valve and Strainer for Reverse flow 47
SA47C-101-102, Valve and Strainer for Reverse flow 47
SKU: 341700
McDonnell & Miller
SKU: 341700
Brand: McDonnell & Miller
$505.77 each
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Product Image of SA53-6, Valve Assembly for 53
SA53-6, Valve Assembly for 53
SKU: 342800
McDonnell & Miller
SKU: 342800
Brand: McDonnell & Miller
$647.15 each
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Product Image of SA851S-4, Bellows Bracket Assembly for 851 & 851S
SA851S-4, Bellows Bracket Assembly for 851 & 851S
SKU: 352925
McDonnell & Miller
SKU: 352925
Brand: McDonnell & Miller
$486.21 each
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Product Image of 159-24, Brass Y Fittings for 42A, 47, 64A, 67
159-24, Brass Y Fittings for 42A, 47, 64A, 67
SKU: 328500
McDonnell & Miller
SKU: 328500
Brand: McDonnell & Miller
$126.27 each
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Product Image of 851-105, Float Rod for 851
851-105, Float Rod for 851
SKU: 335700
McDonnell & Miller
SKU: 335700
Brand: McDonnell & Miller
$48.20 each
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Product Image of 851S-105, Float Rod for 851S
851S-105, Float Rod for 851S
SKU: 335750
McDonnell & Miller
SKU: 335750
Brand: McDonnell & Miller
$54.00 each
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Product Image of FS7S-4R-4, Paddle Arm Kit
FS7S-4R-4, Paddle Arm Kit
SKU: 337550
McDonnell & Miller
SKU: 337550
Brand: McDonnell & Miller
$220.00 each
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Product Image of FS7-VL-4R-4, Long Paddle Arm Kit
FS7-VL-4R-4, Long Paddle Arm Kit
SKU: 337650
McDonnell & Miller
SKU: 337650
Brand: McDonnell & Miller
$265.09 each
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Product Image of SA27W-6, Valve Mechanism Assembly
SA27W-6, Valve Mechanism Assembly
SKU: 340100
McDonnell & Miller
SKU: 340100
Brand: McDonnell & Miller
$1,793.30 each
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Product Image of SWA158S, Snap Switch Assembly for 158 Water Feeder
SWA158S, Snap Switch Assembly for 158 Water Feeder
SKU: 310468
McDonnell & Miller
SKU: 310468
Brand: McDonnell & Miller
$485.00 each
In Stock
Get 1 by Fri, Jun 12
In Stock
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Product Image of 150S-B-M, Mechanical Low Water Cutoff & Pump Controller w/ Manual Reset (Steam)
150S-B-M, Mechanical Low Water Cutoff & Pump Controller w/ Manual Reset (Steam)
SKU: 150S-B-M
McDonnell & Miller
SKU: 150S-B-M
Brand: McDonnell & Miller
$4,084.16 each
In Stock
Get 16 by Fri, Jun 12
In Stock
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Product Image of 193-7B-M, Combo Low Water Cut-Off & Pump Controller w/ #7B Switch w/ Manual Reset (Steam)
193-7B-M, Combo Low Water Cut-Off & Pump Controller w/ #7B Switch w/ Manual Reset (Steam)
SKU: 164525
McDonnell & Miller
SKU: 164525
Brand: McDonnell & Miller
$3,844.53 each
In Stock
Get 1 by Thu, Jun 11 - Mon, Jun 15
In Stock
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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 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 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 193-D-7B, Combo Low Water Cut-Off & Pump Controller w/ #7B Switch w/ Alternate Tappings (Steam)
193-D-7B, Combo Low Water Cut-Off & Pump Controller w/ #7B Switch w/ Alternate Tappings (Steam)
SKU: 163903
McDonnell & Miller
SKU: 163903
Brand: McDonnell & Miller
$3,949.44 each
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Product Image of 64-A-M, Float Type LWCO w/ Quick Hook Up, w/ Manual Reset
64-A-M, Float Type LWCO w/ Quick Hook Up, w/ Manual Reset
SKU: 143702
McDonnell & Miller
SKU: 143702
Brand: McDonnell & Miller
$931.25 each
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Product Image of UHW-RB-24B Replacement Wiring Harness for B-24E-B
UHW-RB-24B Replacement Wiring Harness for B-24E-B
SKU: 144695
McDonnell & Miller
SKU: 144695
Brand: McDonnell & Miller
$60.62 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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Get it by Thu, Jul 9 - Thu, Aug 6
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More About McDonnell & Miller
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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