Mcdonnell & Miller Flow Switches

The flow of liquids in pipelines plays an important role in industry and commerce. Under most circumstances it is essential to know whether or not there is a flow in a pipeline, and to act upon that knowledge. That is the reason for, and the function of, McDonnell & Miller Flow Switches. A complete line of Liquid Mcdonnell & Miller Flow Switches has been developed for a wide range of applications and literally hundreds of uses.

Manuals -


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  • FS1, 1/2" Flow Switch View Specs
    • SKU: 113200
    • Brand: Mcdonnell & Miller

    $185.95 / each

    $536.85 / box
    3 x $178.95

    Out of Stock Allow 5-7 Days to Ship Out
  • FS1-G, 1/2" Flow Switch w/ Gold Plated Contacts View Specs
    • SKU: 113250
    • Brand: Mcdonnell & Miller

    $183.95 / each

    On Backorder Expected to Ship in 3-4 Weeks
  • FS1-W, 1/2" Flow Switch w/ NEMA 4X enclosure View Specs
    • SKU: 113601
    • Brand: Mcdonnell & Miller

    $199.95 / each

    In Stock! (4 Available) Ships in 24-48 Hrs
  • FS4-3D, 1" Flow Switch 4-3 W/2 SPDT Switches View Specs
    • SKU: 114550
    • Brand: Mcdonnell & Miller

    $179.95 / each

    In Stock! (15 Available) Ships in 24-48 Hrs
  • FS4-3DS, 1" Flow Switch w/Stainless Steel Body and 2 SPDT switches View Specs

    $399.95 / each

    In Stock! (4 Available) Ships in 24-48 Hrs
  • FS4-3S, 1" Flow Switch w/Stainless Steel Body, monel bellows View Specs
    • SKU: 114641
    • Brand: Mcdonnell & Miller

    $345.95 / each

    In Stock! (6 Available) Ships in 24-48 Hrs
  • FS4-3Z, 1" Flow Switch w/ ANSI terminal connections View Specs
    • SKU: 114410
    • Brand: Mcdonnell & Miller

    $119.95 / each

    $341.85 / box
    3 x $113.95

    On Backorder Expected to Ship in 3-4 Weeks
  • FS4-3T1-3/4, 3/4" Flow Switch w/NPT body (High Flow Rate) View Specs
    • SKU: 114800
    • Brand: Mcdonnell & Miller

    $169.95 / each

    In Stock! (7 Available) Ships in 24-48 Hrs
  • FS4-3T2-3/4, 3/4" Flow Switch w/ NPT body (Medium Flow Rate) View Specs
    • SKU: 114900
    • Brand: Mcdonnell & Miller

    $169.95 / each

    On Backorder Expected to Ship in 3-4 Weeks
  • FS4-3T3-3/4, 3/4" Flow Switch w/NPT body (Low Flow Rate) View Specs
    • SKU: 115000
    • Brand: Mcdonnell & Miller

    $169.95 / each

    In Stock! (1 Available) Ships in 24-48 Hrs
  • FS4-3T1-1, 1" Flow Switch w/ NPT body (High Flow Rate) View Specs
    • SKU: 115100
    • Brand: Mcdonnell & Miller

    $169.95 / each

    In Stock! (4 Available) Ships in 24-48 Hrs
  • FS4-3T2-1, 1" Flow Switch w/ NPT body (Medium Flow Rate) View Specs
    • SKU: 115200
    • Brand: Mcdonnell & Miller

    $169.95 / each

    On Backorder Expected to Ship in 3-4 Weeks
  • FS4-3T3-1, 1" Flow Switch w/ NPT body (Low Flow Rate) View Specs
    • SKU: 115300
    • Brand: Mcdonnell & Miller

    $163.95 / each

    $479.85 / box
    3 x $159.95

    In Stock! (4 Available) Ships in 24-48 Hrs
  • FS5-3/4, 3/4" Flow Switch View Specs
    • SKU: 114760
    • Brand: Mcdonnell & Miller

    $184.95 / each

    $530.85 / box
    3 x $176.95

    In Stock! (14 Available) Ships in 24-48 Hrs
  • FS4-3, 1" General Purpose Flow Switch - Paddle Style View Specs
    • SKU: 114400
    • Brand: Mcdonnell & Miller

    $99.95 / each

    $290.85 / box
    3 x $96.95

    In Stock! (329 Available) Ships in 24-48 Hrs
  • FS5-1, 1" Flow Switch View Specs
    • SKU: 114780
    • Brand: Mcdonnell & Miller

    $179.95 / each

    $515.85 / box
    3 x $171.95

    In Stock! (20 Available) Ships in 24-48 Hrs
  • FS5-D-3/4, 3/4 Flow Switch w/2 SPDT switches View Specs
    • SKU: 114763
    • Brand: Mcdonnell & Miller

    $248.95 / each

    In Stock! (1 Available) Ships in 24-48 Hrs
  • FS5-D-1, 1" Flow Switch w/2 SPDT switches View Specs
    • SKU: 114783
    • Brand: Mcdonnell & Miller

    $248.95 / each

    On Backorder Expected to Ship in 3-4 Weeks
  • FS5-DS-1, 1" Flow Switch w/Stainless Steel body, 2 SPDT switches View Specs

    $761.95 / each

    On Backorder Expected to Ship in 3-4 Weeks
  • FS5-S-1, 1" Flow Switch w/ Stainless Steel body View Specs
    • SKU: 114795
    • Brand: Mcdonnell & Miller

    $744.95 / each

    On Backorder Expected to Ship in 3-4 Weeks