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Flow Switch (30)
Flow Switch Part (21)
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Low Water Cutoff (82)
Low Water Cutoff Accessory (75)
Relief Valve (22)
Water Feeder (29)
Water Feeder Part (82)

McDonnell & Miller

McDonnell & Miller
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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
$89.52 each
In Stock
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In Stock
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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 37-200, Replacement Cover
37-200, Replacement Cover
SKU: 312600
McDonnell & Miller
SKU: 312600
Brand: McDonnell & Miller
$12.53 each
In Stock
Get 1 by Tomorrow, Sep 1
In Stock
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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 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 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 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
$56.70 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 FS5-DS-1, 1" Flow Switch w/Stainless Steel body, 2 SPDT switches
FS5-DS-1, 1" Flow Switch w/Stainless Steel body, 2 SPDT switches
SKU: 114793
McDonnell & Miller
SKU: 114793
Brand: McDonnell & Miller
$1,310.60 each
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Product Image of 193-A-M, Combo Low Water Cut-Off & Pump Controller w/ #5 Switch, w/ Alternate Tappings, w/ Manual Reset (Steam)
193-A-M, Combo Low Water Cut-Off & Pump Controller w/ #5 Switch, w/ Alternate Tappings, w/ Manual Reset (Steam)
SKU: 164200
McDonnell & Miller
SKU: 164200
Brand: McDonnell & Miller
$2,373.49 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 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 FS8-33, Replacement Switch
FS8-33, Replacement Switch
SKU: 310478
McDonnell & Miller
SKU: 310478
Brand: McDonnell & Miller
$133.00 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
$2,971.73 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 851, Make-Up Water Feeder
851, Make-Up Water Feeder
SKU: 136700
McDonnell & Miller
SKU: 136700
Brand: McDonnell & Miller
$1,490.00 each
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Product Image of 250-3/4-36, Relief Valve 3/4" NPT, 36 psi (2.5 kg/cm2)
250-3/4-36, Relief Valve 3/4" NPT, 36 psi (2.5 kg/cm2)
SKU: 181325
McDonnell & Miller
SKU: 181325
Brand: McDonnell & Miller
$164.35 each
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Product Image of FS8-WZ, 1" Flow Switch w/ ANSI terminal connections
FS8-WZ, 1" Flow Switch w/ ANSI terminal connections
SKU: 120605
McDonnell & Miller
SKU: 120605
Brand: McDonnell & Miller
$251.71 each
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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
$380.00 each
In Stock
Get 6 by Wed, Sep 2
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 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 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 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
$3,333.90 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 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
$296.97 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
$379.33 each
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Product Image of FS7-28L, Replacement Paddle for FS7-F4
FS7-28L, Replacement Paddle for FS7-F4
SKU: 337900
McDonnell & Miller
SKU: 337900
Brand: McDonnell & Miller
$165.00 each
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Product Image of FS4-3D-17, Replacement SPDT Switch for Flow Switches
FS4-3D-17, Replacement SPDT Switch for Flow Switches
SKU: 305512
McDonnell & Miller
SKU: 305512
Brand: McDonnell & Miller
$36.47 each
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Product Image of FS7-4EL, 1-1/4" Flow Switch w/ NEMA 7 & 9 enclosure, w/extended paddle & paddle arm
FS7-4EL, 1-1/4" Flow Switch w/ NEMA 7 & 9 enclosure, w/extended paddle & paddle arm
SKU: 120150
McDonnell & Miller
SKU: 120150
Brand: McDonnell & Miller
$751.93 each
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Product Image of 51-2-M, Mechanical Water Feeder w/ No. 2 Switch (LWCO Function), w/ Manual reset
51-2-M, Mechanical Water Feeder w/ No. 2 Switch (LWCO Function), w/ Manual reset
SKU: 135200
McDonnell & Miller
SKU: 135200
Brand: McDonnell & Miller
$1,850.62 each
In Stock
Get 19 by Wed, Sep 2
In Stock
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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 S-2, Switch Cover Replacement
S-2, Switch Cover Replacement
SKU: 308000
McDonnell & Miller
SKU: 308000
Brand: McDonnell & Miller
$23.62 each
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Product Image of 250-1-15, Relief Valve 1" NPT, 15 psi (1 kg/cm2)
250-1-15, Relief Valve 1" NPT, 15 psi (1 kg/cm2)
SKU: 181920
McDonnell & Miller
SKU: 181920
Brand: McDonnell & Miller
$266.60 each
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Product Image of 157S-R-MD, Float Type, Combo LWCO & Pump Controller w/ Water Column, alternate tappings, maximum differential (Steam)
157S-R-MD, Float Type, Combo LWCO & Pump Controller w/ Water Column, alternate tappings, maximum differential (Steam)
SKU: 176222
McDonnell & Miller
SKU: 176222
Brand: McDonnell & Miller
$2,322.40 each
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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
$929.08 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 FS7-4S, 1-1/4" Flow Switch w/ Stainless Steel Body
FS7-4S, 1-1/4" Flow Switch w/ Stainless Steel Body
SKU: 120160
McDonnell & Miller
SKU: 120160
Brand: McDonnell & Miller
(1)
$1,079.16 each
In Stock
Get 1 by Wed, Sep 2
In Stock
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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 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 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 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 Tomorrow, Sep 1
In Stock
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Product Image of 250-2-45, Relief Valve 2" NPT, 45 psi (3.2 kg/cm2)
250-2-45, Relief Valve 2" NPT, 45 psi (3.2 kg/cm2)
SKU: 183225
McDonnell & Miller
SKU: 183225
Brand: McDonnell & Miller
$1,242.20 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 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 51-S-2-M, Mechanical Water Feeder w/ no. 2 Switch (LWCO Function), w/ Manual Reset
51-S-2-M, Mechanical Water Feeder w/ no. 2 Switch (LWCO Function), w/ Manual Reset
SKU: 136000
McDonnell & Miller
SKU: 136000
Brand: McDonnell & Miller
$2,468.24 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 P-4-SS Teflon Coated Probe for RS Series Sensors (48")
P-4-SS Teflon Coated Probe for RS Series Sensors (48")
SKU: 179545
McDonnell & Miller
SKU: 179545
Brand: McDonnell & Miller
$80.17 each
Backorder
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Product Image of 64-A, Float Type LWCO w/ quick hook-up fittings
64-A, Float Type LWCO w/ quick hook-up fittings
SKU: 143700
McDonnell & Miller
SKU: 143700
Brand: McDonnell & Miller
$1,064.70 each
In Stock
Get 3 by Wed, Sep 2
In Stock
Get 3 by Wed, Sep 2
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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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