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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 FS5-3/4 3/4"FLOW SW.SPDT,150#,#114760 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_6e1b4b7e-774a-4a8f-b07d-3e299a4c5891_medium.png?v=1723819591)
FS5-3/4 | 3/4"FLOW SW.SPDT, 150#, #114760 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: FS5-3/4
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![MCDONNELL & MILLER 37-27 Valve Bracket Gasket For 51 47 247 USE # 313900 OLD# WAS 312800 ( M5 ) *** SOLD INDIVIDUALLY *** | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mpk-3976_365924a1-4845-41fc-b8da-34c5193ffddd_medium.jpg?v=1718171128)
37-27 | Valve Bracket Gasket For 51 47 247 USE # 313900 OLD# WAS 312800 ( M5 ) *** SOLD INDIVIDUALLY *** | MCDONNELL & MILLER
Brand: MCDONNELL & MILLER
SKU: 37-27
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![Xylem-McDonnell & Miller FS7-4SW 1.25"SS,NEMA4,SPDT,1000#120191 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_1791e88a-c8ab-4dc0-9d76-19c2f82b3f2e_medium.png?v=1718182015)
FS7-4SW | 1.25"SS, NEMA4, SPDT, 1000#120191 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: FS7-4SW
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![MCDONNELL & MILLER 150S-HD Head Mechanism With Snap Switch & Gasket 173003 Replaces 150-HD 150E-HD | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mpk-3856_ed3d79af-e3d5-468d-a0e0-5e1db87e4505_medium.jpg?v=1718204292)
150S-HD | Head Mechanism With Snap Switch & Gasket 173003 Replaces 150-HD 150E-HD | MCDONNELL & MILLER
Brand: MCDONNELL & MILLER
SKU: 150S-HD
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![Xylem-McDonnell & Miller 150S-HD HEAD MECH w/SNAP SWITCH#173003 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/00339795_88cfe8b7-e7d2-4cee-b936-5bbde358fc2f_medium.jpg?v=1718167595)
150S-HD | HEAD MECH w/SNAP SWITCH#173003 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 150S-HD
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![Xylem-McDonnell & Miller 51-2-M FEEDER, W/MAN. RESET #135200 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/51-2-M_e791fa8b-bb9d-4e74-a4a3-d5efc5cb67dc_medium.jpg?v=1722616584)
51-2-M | FEEDER, W/MAN. RESET #135200 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 51-2-M
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![Xylem-McDonnell & Miller FS8-WJ FS8W w/INT'L THREADS #120602 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_b492897f-4c2f-4fb9-869d-405fc97896ea_medium.png?v=1723735481)
FS8-WJ | FS8W w/INT'L THREADS #120602 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: FS8-WJ
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![Xylem-McDonnell & Miller RB-24SE-L LWCO W/Burner Control Harness | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/no-image_fad6bd45-a529-4925-9123-b79990b22e5d_medium.jpg?v=1722356766)
RB-24SE-L | LWCO W/Burner Control Harness | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: RB-24SE-L
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![Xylem-McDonnell & Miller RB-24SE LWCO-UNIV WIRING 24V | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/no-image_229988fc-5724-43a7-9e95-27541ce60f12_medium.jpg?v=1721403556)
RB-24SE | LWCO-UNIV WIRING 24V | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: RB-24SE
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![Xylem-McDonnell & Miller RB-24SE-A LWCO WIRING 4 VENT DAMP | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/no-image_a087db4f-cc9a-472e-8bb3-5acd3b220993_medium.jpg?v=1721403558)
RB-24SE-A | LWCO WIRING 4 VENT DAMP | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: RB-24SE-A
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![Xylem-McDonnell & Miller 158S-M MAN RESET/SNAP SWITCH #172819 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/no-image_c3038359-4b8f-4413-9ede-0e8dd8e21bc2_medium.jpg?v=1721403558)
158S-M | MAN RESET/SNAP SWITCH #172819 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 158S-M
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![Xylem-McDonnell & Miller 93-7B-M 93 W/POT. SWITCH & M/R 163100 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/no-image_346ccb0c-3046-41a7-83ba-2440d0c77e49_medium.jpg?v=1723045128)
93-7B-M | 93 W/POT. SWITCH & M/R 163100 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 93-7B-M
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![Xylem-McDonnell & Miller RS-5-BR-1 5 LEVEL SENSOR PCL/PCH 179528 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/no-image_c3ae20ba-eff9-4aac-b652-98043ed269ca_medium.jpg?v=1721152113)
RS-5-BR-1 | 5 LEVEL SENSOR PCL/PCH 179528 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: RS-5-BR-1
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![Xylem-McDonnell & Miller 157S-RD-MD 157S-MDw/ALTERNATNG TAP#176802 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/no-image_2ed1a51a-afb4-4115-bda5-652dcc2eaae3_medium.jpg?v=1722002039)
157S-RD-MD | 157S-MDw/ALTERNATNG TAP#176802 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 157S-RD-MD
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![Xylem-McDonnell & Miller 157S-P 157w/SIDE PORT/SNAP SW #175802 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/no-image_b18bc018-3af9-442e-92b7-b6db5f571cad_medium.jpg?v=1721152111)
157S-P | 157w/SIDE PORT/SNAP SW #175802 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 157S-P
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![Xylem-McDonnell & Miller 63-B-M LWCO M/R W/FLOAT BLOCK #143300 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/no-image_1c392394-eec2-456b-968b-bc944b63d8b1_medium.jpg?v=1721151620)
63-B-M | LWCO M/R W/FLOAT BLOCK #143300 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 63-B-M
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![Xylem-McDonnell & Miller 176318 PA-750-LP,LOW PRESSURE PROBE | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/no-image_c583f3ad-348c-4fcb-be53-84885966fde9_medium.jpg?v=1721151511)
176318 | PA-750-LP, LOW PRESSURE PROBE | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 176318
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![Xylem-McDonnell & Miller FS7-4W 1.25"NEMA4X,SPDT,300#,#120201 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/no-image_e0e56778-71d4-4968-aa06-5be62f6a67ec_medium.jpg?v=1721151361)
FS7-4W | 1.25"NEMA4X, SPDT, 300#, #120201 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: FS7-4W
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![Xylem-McDonnell & Miller 63-M-HD HEAD MECH FOR 63-M #143200 | Midwest Supply Us](http://midwestsupplyus.com/cdn/shop/files/mcdonnell-and-miller-a-xylem-brand-logo-vector_ee7673e7-9d1f-47ed-80c2-3e2daafb69f9_medium.png?v=1718101298)
63-M-HD | HEAD MECH FOR 63-M #143200 | Xylem-McDonnell & Miller
Brand: Xylem-McDonnell & Miller
SKU: 63-M-HD
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SKU: EPRC1501-NL