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Blackhawk Supply offers McDonnell & Miller backflow preventers, pressure-reducing valves, and water-mixing valves. Shop today!
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![Mcdonnell Miller 115300 Flow Switch FS4-3T3-1 Low Flow SPDT 1 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/995030_2ceb1051-9542-418b-8d44-f476300ed505_medium.jpg?v=1714471163)
115300 | Flow Switch FS4-3T3-1 Low Flow SPDT 1 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 115300
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![Mcdonnell Miller 114610 Flow Switch FS4-3 Single Pole Double Throw 1 Inch BSPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000745_13082d96-8fe6-4b4d-ac42-7e90ed77a36f_medium.jpg?v=1720024329)
114610 | Flow Switch FS4-3 Single Pole Double Throw 1 Inch BSPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 114610
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![Mcdonnell Miller 120191 Flow Switch FS7-4SW Stainless Steel Body NEMA 4X Enclosure Single Pole Double Throw 1-1/4 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000746_00c37255-aa24-43f9-9669-aab82d4b0f13_medium.jpg?v=1720024381)
120191 | Flow Switch FS7-4SW Stainless Steel Body NEMA 4X Enclosure Single Pole Double Throw 1-1 / 4 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 120191
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![Mcdonnell Miller 120175 Flow Switch FS7-4SE Stainless SPDT with NEMA 7-9 Enclosure 1-1/4 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/995090_ba8464ad-89b5-44ca-9527-e6808eda67dc_medium.jpg?v=1720024360)
120175 | Flow Switch FS7-4SE Stainless SPDT with NEMA 7-9 Enclosure 1-1 / 4 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 120175
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![Mcdonnell Miller 120160 Flow Switch FS7-4S with Stainless Steel Body Single Pole Double Throw 1-1/4 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000752_4ca2a23a-065d-4ca8-83c5-e7e1d8818a6c_medium.jpg?v=1720024345)
120160 | Flow Switch FS7-4S with Stainless Steel Body Single Pole Double Throw 1-1 / 4 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 120160
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![Mcdonnell Miller 120150 Flow Switch FS7-4EL with Extended Paddle/Arm Single Pole Double Throw 1-1/4 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000704_045d4160-ae63-4ebc-910c-88b827273aab_medium.jpg?v=1720024374)
120150 | Flow Switch FS7-4EL with Extended Paddle / Arm Single Pole Double Throw 1-1 / 4 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 120150
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![Mcdonnell Miller 120100 Flow Switch FS7-4E Single Pole Double Throw with NEMA 7/9 Enclosure 1-1/4 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000772_a4f3b5a5-3493-45dd-bc51-ab623c54ee99_medium.jpg?v=1720024364)
120100 | Flow Switch FS7-4E Single Pole Double Throw with NEMA 7 / 9 Enclosure 1-1 / 4 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 120100
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![Mcdonnell Miller 119900 Flow Switch FS7-4L with Extended Paddle/Arm Single Pole Double Throw 1-1/4 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000693_9907fdf3-3e24-44cd-bfa3-73a53c08d889_medium.jpg?v=1720024384)
119900 | Flow Switch FS7-4L with Extended Paddle / Arm Single Pole Double Throw 1-1 / 4 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 119900
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![Mcdonnell Miller 119750 Flow Switch FS7-4D with 2 SPDT 1-1/4 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/995161_medium.jpg?v=1717077060)
119750 | Flow Switch FS7-4D with 2 SPDT 1-1 / 4 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 119750
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![Mcdonnell Miller 115652 Flow Switch FS6-W-1 with NEMA 4X Enclosure SPDT 1 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/995114_4d93b162-9f3a-4375-ba3b-2554f772f8e1_medium.jpg?v=1720024343)
115652 | Flow Switch FS6-W-1 with NEMA 4X Enclosure SPDT 1 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 115652
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![Mcdonnell Miller 115200 Flow Switch FS4-3T2-1 Single Pole Double Throw 1 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000751_0f2972d7-9ef7-4c77-868f-c20dd1654b16_medium.jpg?v=1720024339)
115200 | Flow Switch FS4-3T2-1 Single Pole Double Throw 1 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 115200
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![Mcdonnell Miller 115100 Flow Switch FS4-3T1-1 Single Pole Double Throw 1 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000714_1cb24af9-a2b0-4497-9c9a-46f23ddd9878_medium.jpg?v=1720024336)
115100 | Flow Switch FS4-3T1-1 Single Pole Double Throw 1 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 115100
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![Mcdonnell Miller 115000 Flow Switch FS4-3T3-4 Low Flow SPDT 3/4 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/995107_medium.jpg?v=1717076994)
115000 | Flow Switch FS4-3T3-4 Low Flow SPDT 3 / 4 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 115000
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![Mcdonnell Miller 114900 Flow Switch FS4-3T2-3/4 Single Pole Double Throw 3/4 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000643_b3a4111b-89e1-4531-8d3f-bf1189d624f4_medium.jpg?v=1720024333)
114900 | Flow Switch FS4-3T2-3 / 4 Single Pole Double Throw 3 / 4 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 114900
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![Mcdonnell Miller 114800 Flow Switch FS4-3T1-3 High Flow SPDT 3/4 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/995241_d7f4eadc-c492-4f2e-8f02-0d8794ebf945_medium.jpg?v=1720024342)
114800 | Flow Switch FS4-3T1-3 High Flow SPDT 3 / 4 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 114800
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![Mcdonnell Miller 114763 Flow Switch FS5-3/4 with 2 Single Pole Double Throw Switches 3/4 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000737_b48aff9c-9cf6-4b6e-b513-1ab888c2a12f_medium.jpg?v=1720024323)
114763 | Flow Switch FS5-3 / 4 with 2 Single Pole Double Throw Switches 3 / 4 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 114763
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![Mcdonnell Miller 114642 Flow Switch FS4-3DS with 2 Single Pole Double Throw Switches 1 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000750_483c04fd-afd1-42da-ac31-c39cfa8cac9d_medium.jpg?v=1720024333)
114642 | Flow Switch FS4-3DS with 2 Single Pole Double Throw Switches 1 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 114642
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![Mcdonnell Miller 114641 Flow Switch FS4-3S with SPDT Body Stainless Steel 1 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/969422_medium.jpg?v=1720024330)
114641 | Flow Switch FS4-3S with SPDT Body Stainless Steel 1 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 114641
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![Mcdonnell Miller 114550 Flow Switch FS4-3D with 2 SPDT Switches 1 Inch NPT Vertical | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/969462_9cf2fe9e-4f31-451b-b235-42edd3236603_medium.jpg?v=1720024337)
114550 | Flow Switch FS4-3D with 2 SPDT Switches 1 Inch NPT Vertical | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 114550
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![Mcdonnell Miller 113601 Flow Switch FS1-W High Sensitivity Single Pole Double Throw 1/2 Inch NPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000663_e8bdebec-23d1-49f7-a62d-8bdd1af91dfd_medium.jpg?v=1720024303)
113601 | Flow Switch FS1-W High Sensitivity Single Pole Double Throw 1 / 2 Inch NPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 113601
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![Mcdonnell Miller 113550 Flow Switch FS1-J High Sensitivity Single Pole Double Throw 1/2 Inch BSPT | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/1000713_556acc88-dcdb-4adc-af55-aadd927665ba_medium.jpg?v=1720024329)
113550 | Flow Switch FS1-J High Sensitivity Single Pole Double Throw 1 / 2 Inch BSPT | Mcdonnell Miller
Brand: Mcdonnell Miller
SKU: 113550
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