Pros, Join Our TradeMaster Program!
  • FS251, General Purpose Flow Switch w/ NEMA 1 Encl. Product Image
    Add to List
    Add to List
    FS251, General Purpose Flow Switch w/ NEMA 1 Encl. 120611 FS251, General Purpose Flow Switch w/ NEMA 1 Encl.
    SKU: 120611
    Brand: Mcdonnell & Miller
    (15)
    $97.99 each
    120
    Wed, Apr 28
    120
    QtyArrives
    120 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • FS4-3, 1" General Purpose Flow Switch - Paddle Style Product Image
    Add to List
    Add to List
    FS4-3, 1" General Purpose Flow Switch - Paddle Style 114400 FS4-3, 1" General Purpose Flow Switch - Paddle Style
    Contains Lead
    SKU: 114400
    Brand: Mcdonnell & Miller
    (5)
    $119.58 each
    121
    Wed, Apr 28
    121
    QtyArrives
    121 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • Brass Flow Switch w/ Flexible Paddles<br>(Single Switch) Product Image
    Add to List
    Add to List
    Brass Flow Switch w/ Flexible Paddles (Single Switch) IFS01BF-1 Brass Flow Switch w/ Flexible Paddles (Single Switch)
    SKU: IFS01BF-1
    Brand: Taco
    (4)
    $115.12 each
    81
    Wed, Apr 28
    132
    QtyArrives
    81 Wed, Apr 28
    51 Fri, Apr 30 – Mon, May 3
    Questions? Call 1-888-757-4774
    Add to List
  • FS254, General Purpose Flow Switch w/ NEMA 4 Encl. (Replaces FS8-W) Product Image
    Add to List
    Add to List
    FS254, General Purpose Flow Switch w/ NEMA 4 Encl. (Replaces FS8-W) 120610 FS254, General Purpose Flow Switch w/ NEMA 4 Encl. (Replaces FS8-W)
    SKU: 120610
    Brand: Mcdonnell & Miller
    (7)
    $187.03 each
    196
    Wed, Apr 28
    196
    QtyArrives
    196 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • 1" Liquid Flow Switch<br>(Set of 4 Paddles) Product Image
    Add to List
    Add to List
    1" Liquid Flow Switch (Set of 4 Paddles) F261KAH-V01C 1" Liquid Flow Switch (Set of 4 Paddles)
    SKU: F261KAH-V01C
    Brand: Johnson Controls
    (1)
    $113.18 each
    79
    Wed, Apr 28
    79
    QtyArrives
    79 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • Liquid Level Switch w/ Reverse Lever, Open On Rise, NEMA 1 (460V) Product Image
    Add to List
    Add to List
    Liquid Level Switch w/ Reverse Lever, Open On Rise, NEMA 1 (460V) 9036DG2R Liquid Level Switch w/ Reverse Lever, Open On Rise, NEMA 1 (460V)
    SKU: 9036DG2R
    Brand: Square D
    (1)
    $38.61 each
    30
    Wed, Apr 28
    30
    QtyArrives
    30 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • 1" NPT Flow Switch<br>(SS Paddles) Product Image
    Add to List
    Add to List
    1" NPT Flow Switch (SS Paddles) F261MAH-V01C 1" NPT Flow Switch (SS Paddles)
    SKU: F261MAH-V01C
    Brand: Johnson Controls
    (5)
    $186.01 each
    76
    Wed, Apr 28
    76
    QtyArrives
    76 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • Brass Flow Switch NEMA4 Flexible w/ Paddles<br>(Small Turning Radius) Product Image
    Add to List
    Add to List
    Brass Flow Switch NEMA4 Flexible w/ Paddles (Small Turning Radius) IFSWSBF-1 Brass Flow Switch NEMA4 Flexible w/ Paddles (Small Turning Radius)
    SKU: IFSWSBF-1
    Brand: Taco
    (1)
    $161.22 each
    23
    Wed, Apr 28
    61
    QtyArrives
    23 Wed, Apr 28
    38 Fri, Apr 30 – Mon, May 3
    Questions? Call 1-888-757-4774
    Add to List
  • FS5-3/4, 3/4" Flow Switch Product Image
    Add to List
    Add to List
    FS5-3/4, 3/4" Flow Switch 114760 FS5-3/4, 3/4" Flow Switch
    SKU: 114760
    Brand: Mcdonnell & Miller
    (3)
    $205.95 each
    Wed, May 26 – Thu, Jun 24
    Arrives
    Wed, May 26 – Thu, Jun 24
    Questions? Call 1-888-757-4774 or LiveChat Img Chat Us
    Add to List
  • Alternator Liquid Level Switch (NEMA 1) Product Image
    Add to List
    Add to List
    Alternator Liquid Level Switch (NEMA 1) 9038CG36 Alternator Liquid Level Switch (NEMA 1)
    SKU: 9038CG36
    Brand: Square D
    $285.11 each
    14
    Wed, Apr 28
    14
    QtyArrives
    14 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • Liquid Level Switch w/ Viton Packing & Rod, Close On Rise, Left Float (600V) Product Image
    Add to List
    Add to List
    Liquid Level Switch w/ Viton Packing & Rod, Close On Rise, Left Float (600V) 9037HG32LZ20 Liquid Level Switch w/ Viton Packing & Rod, Close On Rise, Left Float (600V)
    SKU: 9037HG32LZ20
    Brand: Square D
    $95.17 each
    36
    Wed, Apr 28
    36
    QtyArrives
    36 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • 2-1/2" NPT Liquid Level Float Switch Product Image
    Add to List
    Add to List
    2-1/2" NPT Liquid Level Float Switch 9037HG33 2-1/2" NPT Liquid Level Float Switch
    SKU: 9037HG33
    Brand: Square D
    (2)
    $117.07 each
    54
    Wed, Apr 28
    54
    QtyArrives
    54 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • FS1, 1/2" Flow Switch Product Image
    Add to List
    Add to List
    FS1, 1/2" Flow Switch 113200 FS1, 1/2" Flow Switch
    SKU: 113200
    Brand: Mcdonnell & Miller
    (3)
    $172.25 each
    86
    Wed, Apr 28
    86
    QtyArrives
    86 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • Liquid Level Switch w/ Rod & Float, Close On Rise, Left Float Position (600V) Product Image
    Add to List
    Add to List
    Liquid Level Switch w/ Rod & Float, Close On Rise, Left Float Position (600V) 9037HG32 Liquid Level Switch w/ Rod & Float, Close On Rise, Left Float Position (600V)
    SKU: 9037HG32
    Brand: Square D
    $191.31 each
    73
    Wed, Apr 28
    73
    QtyArrives
    73 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • 1" NPT Male Universal Flow Switch Product Image
    Add to List
    Add to List
    1" NPT Male Universal Flow Switch 626600A 1" NPT Male Universal Flow Switch
    SKU: 626600A
    Brand: Caleffi
    $124.95 each
    35
    Wed, Apr 28
    35
    QtyArrives
    35 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • 1" Brass Flow Switch w/ Rigid Paddles (Single Switch) Product Image
    Add to List
    Add to List
    1" Brass Flow Switch w/ Rigid Paddles (Single Switch) IFS01BR-1 1" Brass Flow Switch w/ Rigid Paddles (Single Switch)
    SKU: IFS01BR-1
    Brand: Taco
    (1)
    $144.80 each
    13
    Wed, Apr 28
    19
    QtyArrives
    13 Wed, Apr 28
    6 Fri, Apr 30 – Mon, May 3
    Questions? Call 1-888-757-4774
    Add to List
  • Alternator Liquid Level Switch, 2.63" Hinge Post, 5-1/8" Tank Connection Product Image
    Add to List
    Add to List
    Alternator Liquid Level Switch, 2.63" Hinge Post, 5-1/8" Tank Connection 9038DG8 Alternator Liquid Level Switch, 2.63" Hinge Post, 5-1/8" Tank Connection
    SKU: 9038DG8
    Brand: Square D
    $420.75 each
    12
    Wed, Apr 28
    12
    QtyArrives
    12 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • 1" Liquid Flow Switch (SS Paddles) Product Image
    Add to List
    Add to List
    1" Liquid Flow Switch (SS Paddles) F261MAL-V01C 1" Liquid Flow Switch (SS Paddles)
    SKU: F261MAL-V01C
    Brand: Johnson Controls
    $174.30 each
    53
    Wed, Apr 28
    53
    QtyArrives
    53 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • Open Liquid Level Switch, Close On Rise, NEMA 1 (460V) Product Image
    Add to List
    Add to List
    Open Liquid Level Switch, Close On Rise, NEMA 1 (460V) 9036DG2 Open Liquid Level Switch, Close On Rise, NEMA 1 (460V)
    SKU: 9036DG2
    Brand: Square D
    $48.73 each
    11
    Wed, Apr 28
    11
    QtyArrives
    11 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • Alternator Float Switch w/ Rod & Float, Close on Rise, NEMA 1, Left Float (600V) Product Image
    Add to List
    Add to List
    Alternator Float Switch w/ Rod & Float, Close on Rise, NEMA 1, Left Float (600V) 9038CG32 Alternator Float Switch w/ Rod & Float, Close on Rise, NEMA 1, Left Float (600V)
    SKU: 9038CG32
    Brand: Square D
    (1)
    $417.15 each
    15
    Wed, Apr 28
    15
    QtyArrives
    15 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • FS4-15SS, Stainless Steel Paddle Kit<br>w/ 1", 2" 3", & 6" Paddle Product Image
    Add to List
    Add to List
    FS4-15SS, Stainless Steel Paddle Kit w/ 1", 2" 3", & 6" Paddle 310451 FS4-15SS, Stainless Steel Paddle Kit w/ 1", 2" 3", & 6" Paddle
    SKU: 310451
    Brand: Mcdonnell & Miller
    (1)
    $16.10 each
    31
    Wed, Apr 28
    31
    QtyArrives
    31 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • FS-200-W NEMA-1 Paddle-Type Flow Switch Product Image
    Add to List
    Add to List
    FS-200-W NEMA-1 Paddle-Type Flow Switch 00063067 FS-200-W NEMA-1 Paddle-Type Flow Switch
    SKU: 00063067
    Brand: Watts
    $210.00 each
    10
    Wed, Apr 28
    10
    QtyArrives
    10 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • Alternator Switch, 2-Pole, Flange Mount, Close on Rise, NEMA 1 (600V) Product Image
    Add to List
    Add to List
    Alternator Switch, 2-Pole, Flange Mount, Close on Rise, NEMA 1 (600V) 9038AG1 Alternator Switch, 2-Pole, Flange Mount, Close on Rise, NEMA 1 (600V)
    SKU: 9038AG1
    Brand: Square D
    $100.41 each
    17
    Wed, Apr 28
    17
    QtyArrives
    17 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
  • Flange Mounted Liquid Level Switch, Close On Rise, 2-1/16" Float Travel (575V) Product Image
    Add to List
    Add to List
    Flange Mounted Liquid Level Switch, Close On Rise, 2-1/16" Float Travel (575V) 9037EG9 Flange Mounted Liquid Level Switch, Close On Rise, 2-1/16" Float Travel (575V)
    SKU: 9037EG9
    Brand: Square D
    $147.52 each
    19
    Wed, Apr 28
    19
    QtyArrives
    19 Wed, Apr 28
    Questions? Call 1-888-757-4774
    Add to List
FAQs, Manuals & Videos

Resources

Articles

  • A flow switch is an instrument that monitors the flow of steam, air, or liquid. The flow switch sends a signal to a device, such as a pump, to turn on or shut off. Flow switches can be used for air conditioning, heating and hydronic systems, among other applications.

    Air flow switches are used in applications that require low to high velocity, providing an economical way to detect change or loss of air flow velocity. This change or loss may be caused by a closed damper or fan inlet, loose fan wheel, slipped or broken fan belt, dirty or clogged filter, or an overload on a fan motor switch.

    Liquid flow switches have a universal design and serve a wider range of applications, such as starting or stopping electrically operated equipment like signal lights, alarms, motors, and automatic burners. In addition, liquid flow switches are used for general purpose applications with environmental exposure or applications requiring a water-tight or dust-tight flow switch. The liquid-flow F61 Series flow switch, manufactured by Johnson Controls, responds to fluid flow in lines carrying water, ethylene glycol, or other nonhazardous fluids. It also responds to low fluid flow rates in applications with pipe sizes under 1" trade size.

    Our website offers a vast selection of McDonnell & Miller Johnson Controls, Watts. and Taco flow switches that suit a wide range of residential, commercial, and industrial applications.

NEED HELP?

888-757-4774
Closed Now: Phone Hours
Monday – Thursday
8am–7:45pm ET
Friday
9am–7:45pm ET
  • Product Image

  • Product Image

    Select 2 to 3 items to compare

  • Product Image

    Compare up to 1 more item

Why don't we show the price of this item?

We try to always offer you the lowest prices possible, but some manufacturers require that we only show these low prices once you take further action.

To see the price, simply add the item to your cart or sign in.