McDonnell & Miller

McDonnell & Miller

  • 126800 McDonnell & Miller 25-A Make-Up Water Feeder
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    126800 McDonnell & Miller 25-A Make-Up Water Feeder

    McDonnell & Miller

    $1,387.95
    126800 McDonnell & Miller Make-Up Water Feeder Model 25-A. McDonnell & Miller Model 21 Water Feeder Instruction Manual Features: For boiler receiver tanks
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    42.00 LBS
    $1,387.95
    Add to Cart
  • 123200 McDonnell & Miller Air Flow Switch Model AF2

    123200 McDonnell & Miller AF2 Air Flow Switch Model AF2

    McDonnell & Miller

    123200 McDonnell & Miller Air Flow Switch Model AF2. McDonnell & Miller AF1 Flow Switch Instruction Manual For low velocity applications: Padd
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    2.00 LBS
  • 171702 McDonnell & Miller Hi Pressure Level Control 150S
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    171702 McDonnell & Miller Hi Pressure Level Control 150S

    McDonnell & Miller

    $1,196.95
    171702 McDonnell & Miller Hi Pressure Level Control 150S. McDonnell & Miller 150S Instruction Manual Features and Benefits For commercial and industrial low or high pr
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    27.00 LBS
    $1,196.95
    Add to Cart
  • 132800 McDonnell & Miller Water Feeder LWCO 47-2
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    132800 McDonnell & Miller Water Feeder LWCO 47-2

    McDonnell & Miller

    $1,448.95
    132800 McDonnell & Miller Water Feeder LWCO 47-2. Features: For steam and hot water boilers with cold water feed Continuous maintenance of minimum safe water level, independent of electrical...
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    30.00 LBS
    $1,448.95
    Add to Cart
  • 115000 McDonnell & Miller FS4-3T3-3/4 - 3/4" Flow Switch

    115000 McDonnell & Miller FS4-3T3-3/4 - 3/4" Flow Switch

    McDonnell & Miller

    McDonnell & Miller FS4-3T3-3/4 - 3/4" Flow Switch With NPT Body Low Flow Rate 115000. McDonnell & Miller FS4 Instruction Manual
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    3.00 LBS
  • 142400 McDonnell & Miller Mechanical LWCO 63
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    142400 McDonnell & Miller Mechanical LWCO 63

    McDonnell & Miller

    $768.95
    142400 McDonnell & Miller Mechanical Low Water Cut Off 63. Mechanical For Steam Boilers. Mcdonnell & Miller LWCO Series 63 Instruction Manual
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    11.00 LBS
    $768.95
    Add to Cart
  • 127100 McDonnell & Miller 25-A-HD Head Assembly
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    127100 McDonnell & Miller 25-A-HD Head Assembly

    McDonnell & Miller

    $1,274.95
    127100 McDonnell & Miller 25-A-HD Head Assembly. Features: For boiler receiver tanks Float operated Proportional feed action Soft seat provides positive seal Seal between float chamber and...
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    20.00 LBS
    $1,274.95
    Add to Cart
  • 120160 McDonnell & Miller FS7-4S - 1-1/4" Flow Switch
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    120160 McDonnell & Miller FS7-4S - 1-1/4" Flow Switch

    McDonnell & Miller

    $894.95
    120160 McDonnell & Miller FS7-4S - 1-1/4" Flow Switch With Stainless Steel Body 120160. Mcdonnell & Miller 120160 Instruction Manual Features: Universal desig
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    5.00 LBS
    $894.95
    Add to Cart
  • 181905LF McDonnell & Miller Relief Valve 250-3/4-60
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    181905LF McDonnell & Miller Relief Valve 250-3/4-60

    McDonnell & Miller

    $324.95
    181905LF McDonnell & Miller Relief Valve 250-3/4-60. Features and Benefits: For tanks and hydronic heating systems Protects against over-pressure Minimizes hammering with flash steam Low...
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    3.00 LBS
    $324.95
    Add to Cart
  • 123010 McDonnell & Miller Air Flow Switch Model AFE-1

    123010 McDonnell & Miller AFE-1 Air Flow Switch

    McDonnell & Miller

    123010 McDonnell & Miller Air Flow Switch Model AFE-1 Hazardous Environment Applications. Information: McDonnell &am
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    7.00 LBS
  • 129302 McDonnell & Miller 42S Pump Controller LWCO 42S
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    129302 McDonnell & Miller 42S Pump Controller LWCO

    McDonnell & Miller

    $1,134.95
     129302 McDonnell & Miller Pump Controller LWCO 42S. Instruction Manual Features: For Residential, Commercial, & Industrial low and medium
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    17.00 LBS
    $1,134.95
    Add to Cart
  • 181525 McDonnell & Miller Relief Valve 250-3/4-50 - 3/4" NPT
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    181525 McDonnell & Miller Relief Valve 250-3/4-50 - 3/4" NPT

    McDonnell & Miller

    $184.95
    181525 McDonnell & Miller Relief Valve 250-3/4-50 - 3/4" NPT. Features and Benefits: For tanks and hydronic heating systems Protects against over-pressure Minimizes hammering with flash...
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    3.00 LBS
    $184.95
    Add to Cart
  • 122800 McDonnell Miller Air Flow Switch Model AF1

    122800 McDonnell Miller Air Flow Switch Model AF1

    McDonnell & Miller

    122800 McDonnell Miller Air Flow Switch Model AF1. McDonnell & Miller AF1 Flow Switch Instruction Manual
    Availability:
    This Item Usually Ships The Same Day!
    Weight:
    3.00 LBS

Boiler Controls. McDonnell & Miller Low Water cut-offs are specially designed to protect steam and hot water boilers from the hazards of a low water condition. In operation they will interrupt the electrical current to the firing device, if the water in the system drops below the boiler manufacturer’s minimum safe water level. Our low water cut-offs also provide an additional circuit for a low water alarm, should you desire to install one, for additional protection.

If you have any questions please give us a call at 1-800-781-7405 or email us your request. Sales@NationalPumpSupply.com