mcdonnell miller
McDonnell Miller, a trusted name in boiler controls and flow switches, offers a comprehensive collection of products designed for efficiency and reliability. Explore our selection and find the perfect fit for your needs.
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![Xylem-McDonnell & Miller FS6-1 1"FLOW SW.150# SPDT, #115600 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_134facbd-9a43-43ec-ad4a-d8b917371141_medium.png?v=1719353910)
FS6-1 | 1"FLOW SW.150# SPDT, #115600 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: FS6-1
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![Xylem-McDonnell & Miller 354310 HEAD GASKET FOR PFC,VFC | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_9d9f2295-9c13-4fdc-a0cf-8ef55eb0ad41_medium.png?v=1718061841)
354310 | HEAD GASKET FOR PFC, VFC | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 354310
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![Xylem-McDonnell & Miller 340700 SA37-38 STRAINER BASKET ASSMB | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_04f3ebe1-57fd-42fc-907a-33a132730ef9_medium.png?v=1718113272)
340700 | SA37-38 STRAINER BASKET ASSMB | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 340700
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![Xylem-McDonnell & Miller 341600 SA47-101-102,VLV & STRAINR ASY | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_1a0c7d6d-4241-4f7b-b808-df319b4a92b7_medium.png?v=1718226924)
341600 | SA47-101-102, VLV & STRAINR ASY | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 341600
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![Xylem-McDonnell & Miller 310802 SW-FS250 REPLACEMENT SWITCH | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_e15e669c-b8c3-456d-92d4-0ebf2da693fc_medium.png?v=1720556368)
310802 | SW-FS250 REPLACEMENT SWITCH | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 310802
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![Xylem-McDonnell & Miller 306800 FS7S-28, 6"S.S.PADDLE | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_fb9d1b1d-62cf-4ee4-93f8-fa47c9068874_medium.png?v=1718153900)
306800 | FS7S-28, 6"S.S.PADDLE | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 306800
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![Xylem-McDonnell & Miller 6667-MV HEAD ASSM FOR 67-G 153850 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_87036ec8-10d0-4ead-96e0-c32b505d407a_medium.png?v=1720035508)
6667-MV | HEAD ASSM FOR 67-G 153850 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 6667-MV
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![Xylem-McDonnell & Miller AFE-1 X-PRF AIR FLOW SWITCH,#123010 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_b0043305-870d-49c8-bb87-f3d665ae0b72_medium.png?v=1718243595)
AFE-1 | X-PRF AIR FLOW SWITCH, #123010 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: AFE-1
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![Xylem-McDonnell & Miller 193-B 193w/1.25"TAPS,3/4"G.GL.163600 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_36296573-1ab1-4cbd-8fe5-ebd219052cdd_medium.png?v=1718009099)
193-B | 193w/1.25"TAPS, 3/4"G.GL.163600 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 193-B
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![Xylem-McDonnell & Miller 318827 O RING SQUARE CUT NEW STYLE | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_0d1d5e36-dec7-44e1-9caa-9970d72c08e0_medium.png?v=1718196593)
318827 | O RING SQUARE CUT NEW STYLE | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 318827
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![Xylem-McDonnell & Miller 767 LWCOw/2.5"TAP,20#STEAM,#153700 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/00340037_c1835c11-2403-4ea6-b089-64b76b5efa4b_medium.jpg?v=1720037023)
767 | LWCOw/2.5"TAP, 20#STEAM, #153700 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 767
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![Xylem-McDonnell & Miller 307000 FS7-31, SWITCH FOR FS7 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_cb335ea0-cd4c-489c-b495-98feaafb9e05_medium.png?v=1718042452)
307000 | FS7-31, SWITCH FOR FS7 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 307000
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![Xylem-McDonnell & Miller 347600 SA150-11, FLOAT & ROD ASSY | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_658b0fc3-7005-4854-a2d4-c5ee183ba3fb_medium.png?v=1718113304)
347600 | SA150-11, FLOAT & ROD ASSY | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 347600
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![Xylem-McDonnell & Miller 347100 SA101-38, STRAINER ASSY. | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_588e51e7-a037-467f-be95-e1a6c07eb20b_medium.png?v=1718113306)
347100 | SA101-38, STRAINER ASSY. | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 347100
Application
- 101A; 47; 247; 847 Water Feeders
- 25-A Series Make-Up Water Feeder
- 42 and 42S Series Low Water Cut-Offs/Pump Controller
- 51; 851 Water Feeder
- Boiler Control
- Commercial/Industrial Low or High Pressure Boilers
- Commercial/Industrial Low or High Pressure Steam Boilers
- Electronic for Hot Water and Steam Boiler
- Low Water Cut Offs Water Feeder
- Low Water Cut Offs; Steam Boilers
- Primary Low Water Fuel Cut Off Protection and Pump Control for Commercial and Industrial Steam Boiler
- Protection Against High Water Condition in Steam Boilers and Other Water Level Applications
- Residential/Commercial Boilers with Steaming Capacity
- Residential/Commercial Industrial Low and Medium Pressure Steam Boilers with Separate Water Column
- Residential/Commercial Low Pressure Steam Boiler
- Residential/Commercial/Industrial Boiler with Steaming Capacity
- Series 247 and 247-2 Combination Low Water Cut-Offs/Pump Controllers
- Series 63 Low Water Cut-Offs
- Series FS4-3 and FS8-W General Purpose Liquid Flow Switches
- Tanks and Hydronic Heating Systems
- Water Feeders
Collection
End Connection
Material
Part Number
Pressure
Product Type
- 150S-HD with Manual Reset and Maximum Differential
- 158-S-HD with Manual Reset
- 2 Level High Pressure
- 51-2HD for Mechanical Water Feeder with Number 2 Switch Low Water Cut Off
- 69 with 1-3/16IN Insertion Length
- 851-S Make-Up with Extended Float and Rod Assembly
- Air
- Assembly CTRD-101
- Assembly CTRD-51
- Assembly For RS Series
- Assembly G-3-SS
- Assembly for 93/193/194 Control
- Auto Reset
- Ball Type for 47/247/67/70B Series
- Basket SA101-38
- CO-106 Screw and Pin
- Cast Iron Sensor Chamber with Probes
- Combination Pump Controller
- Combo Low Water Cut Off with Auto Reset SPST
- Combo Low Water Cut Off with Float Manual Reset SPST/SPDT
- Combo Low Water Cut Off with Maximum Differential SPST SPDT
- Combo Low Water Cut Off with Number 5 Switch
- Combo Low Water Cut Off with Quick Hook Up Fitting SPST
- Cover 4 Hole for RS-1 BR-1 Remote Sensor
- Cover for VFS VFC Gasket-PFC Series
- Cutoff with Manual Reset
- Direct Acting Liquid Level 3-15PSI Output
- Dirt Pocket 47-171 for 47/247 Series
- Electric
- Electric Replacement
- Electronic Manual Reset Probe
- Electronic with Auto Reset
- Electronic with Burner Control Harness
- Electronic with Manual Reset
- FLT-51-05 for 51 Water Feeder
- FS4-15
- FS4-3S with SPDT Body Stainless Steel
- FS4-3T1-3 High Flow SPDT
- FS4-3T3-4 Low Flow SPDT
- FS7-4D with 2 SPDT
- FS7-4SE Stainless SPDT with NEMA 7-9 Enclosure
- Fitting Lower for 42A/47/64A/67 Series
- Fitting Upper for 47/64/42/42S Series
- Fitting for 67 Series
- Float Arm 21-109 Model
- Float Type
- Float Type 3-18IN Insertion
- Float Type Auto Reset Number 2 Switch
- Float Type Manual Reset Number 2 Switch
- Float Type with 1-3/4IN Insertion
- Float Type with 2-1/4IN Insertion Length
- Float for Pneumatic Actuated Series PFC
- For 150 Series Snap Switch
- For 21 Series
- For 61/64/67/69/70/764/767
- For 64 Series
- For 69+ Series Model SA69-104
- For Combo Low Water Cut Off/Pump Controller With Manual Reset
- For Float Type Combo Low Water Cut Off/Pump Controller with Manual Reset
- For Low Water Cut Off 63 Series
- For Low Water Cut Off 64 Series
- For Low Water Cut Off 750/750-MT-120/PS800/PS801/PS850/PS851 Series
- For Mechanical Water Feeder 51 Series
- For RB-24E-S
- For Series 21 Make-Up Water Feeders
- For Series 51/52-2 Bellows Water Feeder BA-51-05
- For Series 851-S Make-Up Water Feeders
- For Series BA-551-05 Bellows
- For TC-4 Test-N-Check Valve
- For Water Feeder 25-A Series
- General Purpose Liquid SPDT
- General Purpose SPDT
- General Purpose SPDT with NEMA-1 Enclosure
- General Purpose SPDT with NEMA-4 Enclosure
- Ground
- High Pressure Model PA-750-HP
- High Sensitivity Liquid SPDT
- High Sensitivity SPDT
- High Sensitivity Single Pole Double Throw
- Insert for Low Water Cut Off 67 Series
- Junction F/Series 150-150S Low Water Cut Off Pump Controller
- Kit Model FS7-4W
- Large Model SA47-4
- Less Quick Hook Up Fittings
- Less Switch Steam 93-HDLS
- Liquid
- Long Barrel
- Long EA-157L for Series 157S-RBP
- Low Water Cut Off Controller Less Switch
- Low Water Cut Off Float Type Snap Switch SPST/SPDT
- Low Water Cut Off Float with Maximum Differential SPST/SPDT
- Low Water Cut Off Less Quick Hook Up Fittings
- Low Water Cut Off Number 5 Switch with Water Column
- Low Water Cut Off Proportional 7B with Manual Reset
- Low Water Cut Off Snap Acting Switch
- Low Water Cut-off
- Lower Test Model TC-L
- Main Valve 2200-2300
- Make Up
- Make Up Proportional Feed Action
- Make-Up for Model 847
- Manual Reset
- Manual Reset with Barrel Probe
- Manual Reset with Short Probe
- Manual Reset with Standard Probe
- Mechanical
- Mechanical Dual Switch
- Mechanical Less Quick Hook Up Fittings
- Medium Velocity Single Pole Double Throw
- Model 250-1 1.437M BTU
- Model 260-1
- Model BA-53-05
- Paddle Kit with 1IN and 6IN Paddles
- Potentiometer Automatic Reset
- Probe Style Auto Reset
- Probe for 4 Level Remote Sensor Model RS-4-BR-1
- Quick Hook Up
- Quick Hook Up Auto Reset Float Style
- Quick Hook Up Lever Operated
- RS-1-LP Low Pressure Sensor
- Remote High
- Replacement For 101A Series
- Replacement Harness for RB-24E-L
- Replacement Remote
- Replacement for 42S
- Replacement for 67-G
- Replacement for 93/193 Series Combination Low Water Cut Off Pump Controller
- Replacement for B-24E-B
- Replacement for Low Water Cut Off
- Replacement for Mechanical Water Feeder
- Replacement for Model 63BM/63M Float Type Low Water Cut Off
- Replacement for Model 93/193 Low Water Cut Off
- Replacement with 7B Switch for 94/194 Series Control
- Replacement with Manual Reset
- Reverse Acting Liquid Level 3-15PSI Output
- Reverse Acting Model SWA-PFC-R
- SA150-106R Replacement
- SA150-11 for Series 150/157 with Gasket
- SA159-17
- SA21-6
- SA25-5
- SA25A-15 with Valve Disc
- SA25A-6
- SA27T-75 Diaphragm
- SA37-30
- SA47-104 Replacement
- SA51-9
- SA51-9R
- SA51S-6
- SA63-5
- SA67-2
- Short EA-157S for Series 157S-RBP
- Short PA-Rb-122
- Single Level Remote High Pressure
- Single Pole Double Throw
- Slide Kit Model 7B-1R for 7B Switch
- Snap Action for 150S/157S Model SWA150S-M
- Snap Action for 42S Model SWA42S
- Snap Action for Model SWA150S-MD
- Snap Assembly Replacement
- Snap Assembly for SW-FS250
- Snap FS7-31
- Spring Loaded
- Stainless Steel Body NEMA 4X Enclosure Single Pole Double Throw
- Strainer for WF2U and WFE Series
- Supply for Pneumatic Actuated G-PFC-S
- Switch Replacement
- Teflon Coated
- Test-N- Check
- Universal for Hot Water Boilers with Vent Damper
- Upper SA66-35
- Upper Test Vacuum Breaker with Gasket Model TC-U
- Water Feeder Make-Up for 551S-HD
- With 2 Single Pole Double Throw Switches
- With 4-1/8IN Insertion Length
- With Auto Reset
- With Barrel Probe
- With Blow Down Auto Reset
- With Burner Control Harness
- With Corrosion Coating Single Pole Double Throw
- With Extended Paddle/Arm Single Pole Double Throw
- With Extension Barrel Model PSE-802-24
- With Fitting
- With Float Block
- With Float Block 63B
- With Gasket Model SA53-6
- With Gasket Model SA64-30
- With Gasket SA-63-30
- With Low Water Cut Off #2 Switch
- With Low Water Cut Off #2 Switch Manual Reset
- With Low Water Cut-off Mechanical
- With Manual Reset
- With Manual Reset Quick Hook Up
- With Millivolt Switch Length 1-3/4IN Insertion Length
- With NEMA 7/9 Enclosure Single Pole Double Throw
- With Pump Controller 150S-B with Manual Reset
- With Pump Controller 157S SPDT with Water Column
- With Pump Controller 157S with Manual Reset SPDT
- With Pump Controller 157S-R SPDT with Alternate Tapings
- With Pump Controller 157S-RBP-MD SPDT with 2 Integral Conductance Probes
- With Pump Controller 157S-RL Float Type Combo SPST/SPDT Auto Reset
- With Pump Controller 193 with 7B Switch Steam
- With Pump Controller 193-A with 7B Switch Steam
- With Pump Controller 193-B with 7B Switch Steam
- With Pump Controller 194-A with 7B Switch
- With Pump Controller 94 with 5 Switch SPDT
- With Pump Controller Alternate Tapping
- With Pump Controller Glass Connector
- With Pump Controller Manual Reset
- With Pump Controller Model 93-7B SPDT
- With Pump Controller Model 93-M SPDT Steam
- With Pump Controller Series 7B Switch
- With Pump Controller and Float Block
- With Quick Hook Up Fittings
- With Remote Sensor RX2 Probe
- With Stainless Steel Body Single Pole Double Throw
- With Standard Probe
- With Strainer SA51-101-102
- With Vent Damper Harness Model RB-24E-A
Size
Temperature
Used on
- 101-A Series Electrical Water Feeder and 551-S Series Make-Up Water Feeder
- 21; 25-A and 221 Series Make-Up Water Feeder
- 25-A Series Make-Up Water Feeder
- 64A; 47; 47-2 Controls
- 750B-C3/750B-C4 Series
- Actuation Control
- Air Flow
- Boiler
- Boiler Receiver Tanks
- Commercial and Industrial Liquid Level Open Tank Applications
- Hot Water/Steam Boilers
- Liquid Flow
- Low Pressure Steam and Hot Water Boilers
- Low Pressure Steam/Hot Water Boilers
- MA-159/MA-259 Quick Hook-up Fitting
- Multilevel Control
- PS-800/850 Series
- PS-801-U-120/PS-802-U-24 Series
- RS Sensors
- Series 150E/157E
- Series 21 and 221 Make-Up Water Feeders
- Series 247; 247-2; 47 and 47-2 Combination Low Water Cut-Offs/Pump Controllers
- Series 25A
- Series 51-S and 51-S-2 Combination Mechanical Water Feeder/Low Water Cut-Offs and Series 851-S Make-Up Water Feeders
- Series 51; 851
- Series 61/64/67/69/70
- Series 61; 67; 69 and 767 Low Water Cut-Off
- Series 63 Low Water Cut-Offs and Series 47; 47-2; 247; 247-2; 51; 51-2; 51-S; 51-S-2; 53 and 53-2 Combination Mechanical Water Feeder/Low Water Cut-Offs
- Series 67 Low Water Cut-Offs
- Series 750B Remote Mount Control Modules
- Series 93; 193; 94 and 194 Combination Low Water Cut-Offs/Pump Controllers
- Steam Boilers
- Steam/Hot Water Boilers with Cold Water Feed
- Water Boiler
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