Showing 1–15 of 23 results

  • Bellows, LWCO

    Bellows Assembly for M & M 551 Series

    $310.50

    McDonnell & Miller model number BA-551-05 is a bellows assembly for model number 551S controls. The bracket connects to the float on one end and to the valve mechanism on the other.

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  • Bellows, LWCO, Mcdonnell & Miller

    Fittings, Brass, Y-Style

    $73.38

    McDonnell & Miller model number 159-24 is a brass y-style fitting for  model number(s) 42A, 47, 64A, and 67 controls.

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  • FLOAT, LWCO

    Float Assembly, McDonnell Miller 345700 – Model SA91-60

    $212.13
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  • LWCO

    LWCO, 150S-HD, Head Assembly for 150 series (Snap Switch)

    $597.44

    McDonnell & Miller model number 150S-HD is a head mechanism for model number 150S and 157S controls. Head mechanisms include everything except a float chamber. They allow for quick and easy replacement by removing the bolts on the float chamber and then removing and replacing the new unit, with no need to disrupt piping.

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  • LWCO, Mcdonnell & Miller

    LWCO, 150S-M-HD, Head Replacement w/ Manual Reset

    $597.44

    McDonnell & Miller model number 150S-M-HD is a head mechanism for model number 150S-M and 157S-M controls. Head mechanisms include everything except a float chamber. They allow for quick and easy replacement by removing the bolts on the float chamber and then removing and replacing the new unit, with no need to disrupt piping.

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  • LWCO, Manual Reset

    LWCO, 150S-M, Float Type, Combo LWCO & Pump Controller, w/ Manual Reset

    $558.72

    McDonnell & Miller model number 150S-M is a combination float-operated low water cut-off and pump controller with maximum differential operation, which prevents nuisance burner shut-down in low pressure applications, for steam boilers with a separate water column. This control features a manual reset with two 120 volt bi-metal snap switches. One switch is single pole, single throw for pump control. The other is single pole, double throw for low water cut-off and alarm actuation. Its maximum pressure is 150 psi and it has a tapped 1″ FIP connection.

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  • LWCO

    LWCO, 150S-MD-HD, Head Replacement w/ Manual Reset w/ Maximum Differential

    $660.25

    McDonnell & Miller model number 150S-MD-HD is a head mechanism for model number 150S-M and 157S-M controls with maximum differential. Head mechanisms include everything except a float chamber. They allow for quick and easy replacement by removing the bolts on the float chamber and then removing and replacing the new unit, with no need to disrupt piping.

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  • Complete, LWCO

    LWCO, 150S, Float Type, Combo LWCO & Pump Controller

    $601.98

    McDonnell & Miller model number 150S is a combination float-operated low water cut-off and pump controller with maximum differential operation, which prevents nuisance burner shut-down in low pressure applications, for steam boilers with a separate water column. This control features an automatic reset with two 120 volt bi-metal snap switches. One switch is single pole, single throw for pump control. The other is single pole, double throw for low water cut-off and alarm actuation. Its maximum pressure is 150 psi and it has a tapped 1″ FIP connection.

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  • LWCO

    LWCO, 157S-MD, Float Type, Combo LWCO & Pump Controller w/ Water Column & Max. Differential

    $830.83

    McDonnell & Miller model number 157S-MD is a combination float-operated low water cut-off and pump controller with maximum differential operation, which prevents nuisance burner shut-down in low pressure applications, for steam boilers with a water column. The controller has 1/2″ NPT tappings for gauge glass and tri-cocks. This control features an automatic reset with two 120 volt bi-metal snap switches. One switch is single pole, single throw for pump control. The other is single pole, double throw for low water cut-off and alarm actuation. Its maximum pressure is 50 psi and it has a tapped 1″ FIP connection.

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  • LWCO

    LWCO, 157S-RL, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Alternate Tappings

    $848.56

    McDonnell & Miller model number 157S-RL is a combination float-operated low water cut-off and pump controller for steam boilers with an integral water column. The controller has 1/2″ NPT tappings for gauge glass and tri-cocks. This control features an automatic reset with two 120 volt bi-metal snap switches. One switch is single pole, single throw for pump control. The other is single pole, double throw for low water cut-off and alarm actuation. Its maximum pressure is 150 psi and it has an alternative tapped 1-1/4″ FIP connection.

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  • LWCO

    LWCO, 157S, Float Type, Combo LWCO & Pump Controller w/ Water Column

    $830.83

    McDonnell & Miller model number 157S is a combination float-operated low water cut-off and pump controller for steam boilers with an integral water column. The controller has 1/2″ NPT tappings for gauge glass and tri-cocks. This control features an automatic reset with two 120 volt bi-metal snap switches. One switch is single pole, single throw for pump control. The other is single pole, double throw for low water cut-off and alarm actuation. Its maximum pressure is 150 psi and it has an alternative tapped 1″ FIP connection.

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  • LWCO

    LWCO, 193-7B, Combo Low Water Cut-Off and Pump Controller w/ No. 7B Switch

    $1,684.66
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  • LWCO

    LWCO, 194-7B, Combo Low Water Cut-Off and Pump Controllers w/ No. 7B Switch

    $1,901.10

    McDonnell & Miller model number 194-7B is a combination float-operated low water cut-off and pump controller for steam boilers with water columns. This control features an automatic reset with optional number 7B single pole single throw switches for low water cut-off and pump control and proportional control switch for constant water levels. The controller has 1/2″ NPT tappings for gauge glass and tri-cocks. Its maximum pressure is 250 psi and it has a tapped 1-1/4″ FIP connection.

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  • LWCO

    LWCO, 194, Combo Low Water Cut-Off and Pump Controllers

    $1,422.20

    McDonnell & Miller model number 194 is a combination float-operated low water cut-off and pump controller for steam boilers with water columns. This control features an automatic reset with standard number 5 single pole single throw switches for low water cut-off and pump control. The controller has 1/2″ NPT tappings for gauge glass and tri-cocks. Its maximum pressure is 250 psi and it has a tapped 1-1/4″ FIP connection.

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  • LWCO

    LWCO, 764, Float Type Low Water Cut-off (Steam/Hot Water)

    $425.84

    McDonnell & Miller model number 764 is a float-operated low water cut-off for mounting into 2-1/2″ FIP side tappings with a nipple directly into the boiler. This cut-off features an automatic reset, dual 120 volt switches for low water cut-off and alarm or electric water feeder. Its maximum pressure is 50 psi.

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