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Flow Switch (30)
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McDonnell & Miller

McDonnell & Miller
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Product Image of AF1-122, Paddle Kit for AF1 & AF1-J
AF1-122, Paddle Kit for AF1 & AF1-J
SKU: 336000
McDonnell & Miller
SKU: 336000
Brand: McDonnell & Miller
$47.50 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
$483.01 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
Get 1 by Tomorrow, Sep 1
In Stock
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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 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 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 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 158S-MD, Combination Low Water Cutoff & Pump Controller w/ 2 SPDT switches,w/ Maximum Differential
158S-MD, Combination Low Water Cutoff & Pump Controller w/ 2 SPDT switches,w/ Maximum Differential
SKU: 178404
McDonnell & Miller
SKU: 178404
Brand: McDonnell & Miller
$1,411.69 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 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
In Stock
Get 1 by Wed, Sep 2
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
$163.10 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
$158.91 each
Out of Stock
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Out of Stock
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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 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 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
$1,936.30 each
In Stock
Get 1 by Wed, Sep 2
In Stock
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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 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 Wed, Sep 2
In Stock
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Product Image of 158S-M-MD-HD, Head Assembly for 158S Low Water Cutoff, w/ Manual Reset, w/ Maximum Differential
158S-M-MD-HD, Head Assembly for 158S Low Water Cutoff, w/ Manual Reset, w/ Maximum Differential
SKU: 172822
McDonnell & Miller
SKU: 172822
Brand: McDonnell & Miller
$1,289.38 each
Backorder
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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
Backorder
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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
$3,088.83 each
In Stock
Get 3 by Tue, Sep 8 - Fri, Sep 11
In Stock
Get 3 by Tue, Sep 8 - Fri, Sep 11
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Product Image of 158S-M-MD, Combination Low Water Cutoff & Pump Controller w/ 2 SPDT switches, w/ Manual Reset, w/ Maximum Differential
158S-M-MD, Combination Low Water Cutoff & Pump Controller w/ 2 SPDT switches, w/ Manual Reset, w/ Maximum Differential
SKU: 172820
McDonnell & Miller
SKU: 172820
Brand: McDonnell & Miller
$1,580.00 each
Backorder
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Product Image of SA847-4, Bellows assembly for 847
SA847-4, Bellows assembly for 847
SKU: 352800
McDonnell & Miller
SKU: 352800
Brand: McDonnell & Miller
$480.00 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 157S-RB-MD, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Maximum Differential
157S-RB-MD, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Maximum Differential
SKU: 176601
McDonnell & Miller
SKU: 176601
Brand: McDonnell & Miller
(1)
$2,021.01 each
In Stock
Get 2 by Wed, Sep 2
In Stock
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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
Backorder
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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 Wed, Sep 2
In Stock
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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 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
Backorder
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Product Image of 158S-HD, Head Assembly for 158S Low Water Cutoff
158S-HD, Head Assembly for 158S Low Water Cutoff
SKU: 178602
McDonnell & Miller
SKU: 178602
Brand: McDonnell & Miller
$1,305.17 each
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Product Image of 27-9, Float and Nipple replacement for 27
27-9, Float and Nipple replacement for 27
SKU: 311800
McDonnell & Miller
SKU: 311800
Brand: McDonnell & Miller
$228.18 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 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 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 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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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 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 51S-114, Seat for 51S
51S-114, Seat for 51S
SKU: 316200
McDonnell & Miller
SKU: 316200
Brand: McDonnell & Miller
$111.27 each
In Stock
Get 6 by Wed, Sep 2
In Stock
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Product Image of 158S, Combination Low Water Cutoff & Pump Controller w/ 2 SPDT switches
158S, Combination Low Water Cutoff & Pump Controller w/ 2 SPDT switches
SKU: 178402
McDonnell & Miller
SKU: 178402
Brand: McDonnell & Miller
$1,366.17 each
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Product Image of 53-2-M-HD, Head Replacement for Mechanical Water Feeder
53-2-M-HD, Head Replacement for Mechanical Water Feeder
SKU: 137250
McDonnell & Miller
SKU: 137250
Brand: McDonnell & Miller
$1,741.76 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-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
Backorder
Get it by Thu, Oct 1 - Mon, Nov 2
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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
$213.08 each
Backorder
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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
$959.00 each
Backorder
Get it by Wed, Sep 30 - Wed, Oct 28
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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
Backorder
Get it by Thu, Oct 1 - Mon, Nov 2
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Product Image of 157S-P-MD, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ side ports and maximum differential (Steam)
157S-P-MD, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ side ports and maximum differential (Steam)
SKU: 176223
McDonnell & Miller
SKU: 176223
Brand: McDonnell & Miller
$1,817.79 each
Backorder
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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
Backorder
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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
Backorder
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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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Get it by Wed, Sep 30 - Wed, Oct 28
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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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