McDonnell & Miller

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58 products

One to five probes available for multiple functions. For use on tanks and vessels vented and at atmospheric pressure only. Up to 3 probe rods can be joined for...

Mcdonnell & Miller

Mcdonnell & Miller Ambient Pressure Remote Sensor AS-5S

BrandMcdonnell & Miller

CategoryLiquid Level Controls

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For receiver tanks in commercial or industrial applications Mounts directly on the receiver, eliminating need for equalizing connections Quick-change replaceable...

Mcdonnell & Miller

Mcdonnell & Miller Make-Up Water Feeder Series 851 and 851-S

BrandMcdonnell & Miller

CategoryWater Feeders

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Maximum Water Temperature: 250 F (121 C) Maximum Water Pressure: 160 psi (11.2kg/cm 2 ) Maximum Steam Pressure: 15 psig (1.0 kg/cm 2 ) Can be installed in...

Mcdonnell & Miller

Mcdonnell & Miller RS-1-LP Low Pressure (M&M)

BrandMcdonnell & Miller

CategoryLiquid Level Controls

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Patented Self-Cleaning Probe minimizes scale build-up and extends recommended cleaning interval to 5 years. Brass threads provide a metal-to-metal seal that...

Mcdonnell & Miller

Mcdonnell & Miller RB-122-E – Low Water Cut-Off (M&M)

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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Maintains consistent water level regardless of pressure Water column with integral tappings for gauge glass and tri-cock installations For boilers of any...

Mcdonnell & Miller

Mcdonnell & Miller Series 93,94/193/194 Low Water Cut Off/Pump Controllers

BrandMcdonnell & Miller

CategoryCombination Low Water Cut Offspump Controllers

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In-line configuration eliminates need for a pipe tee Very high flow capacity Actuates at extremely low flow rate Sizes available 3 4 NPT 1 ...

Mcdonnell & Miller

Mcdonnell & Miller Series FS6 High Sensitivity Liquid Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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Green power is on indicating LED Red low water indicating LED 30 second DOM Test button Self-Cleaning probe No lock out with loss of power if probe is in...

Mcdonnell & Miller

Mcdonnell & Miller Series PSE Probe Type LWCO

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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Mcdonnell & Miller

Mcdonnell & Miller Series 14-B Ball Type Blow Down Valve

BrandMcdonnell & Miller

CategoryValves

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Mcdonnell & Miller

Mcdonnell & Miller Model FS6-W High Sensitivity Liquid Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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For steam and hot water boilers with cold water feed Continuous maintenance of minimum safe water level, independent of electrical service Proportional feed...

Mcdonnell & Miller

Mcdonnell & Miller Series 47-2/247-2 Mechanical Water Feeder/LWCO

BrandMcdonnell & Miller

CategoryWater Feeders

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The RB-24E low water cut-off offers several features: Brass threads provide a metal-to-metal seal that ensures a leak-free installation Integrated wrench flats...

Mcdonnell & Miller

Mcdonnell & Miller RB-24E Low Water Cut-Off

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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For low pressure steam boilers with cold water feed Eliminates necessity to manually add water to the boiler Can be used with mechanical or electronic low water...

Mcdonnell & Miller

Mcdonnell & Miller Series 101-A Electric Water Feeders

BrandMcdonnell & Miller

CategoryWater Feeders

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NEMA 1 Enclosure Maximum Temperature 406 F (208 C) Maximum Pressure 250 psig (17.6 kg/cm) For single sensor applications with high-pressure environments....

Mcdonnell & Miller

Mcdonnell & Miller RS-1-HP Series-RS High Pressure Remote Sensor (M&M)

BrandMcdonnell & Miller

CategoryLiquid Level Controls

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For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m2) with hot or cold water feed

Mcdonnell & Miller

Mcdonnell & Miller Series 53/53-2 Mechanical Water Feeders/LWCO

BrandMcdonnell & Miller

CategoryWater Feeders

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Monel bellows provides corrosion resistance Single pole, single throw snap action switches Enclosed junction box protects switches Maximum pressure 50 psi (3.5...

Mcdonnell & Miller

Mcdonnell & Miller Series 42S Low Water Cut-Off/Pump Controllers

BrandMcdonnell & Miller

CategoryCombination Low Water Cut Offspump Controllers

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Easy Field Configurable Control Patented Self-Cleaning Probe Tri-Function Button Condition Indicator Easy, Leak-Free Installation

Mcdonnell & Miller

Mcdonnell & Miller boilerwize® (FPC-1000) Low Water Cut Off

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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1 1 4 NPT Brass with sealed tube construction Single pole, double throw snap switch Magnetic switching mechanism eliminates need for...

Mcdonnell & Miller

Mcdonnell & Miller Series FS7-4 Industrial Liquid Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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Sealed Monel bellows Single pole, double throw snap switch Four stainless steel paddles included 1 , 2 , 3 and 6 (25, 50, 80...

Mcdonnell & Miller

Mcdonnell & Miller Series FS8-W General Purpose Liquid Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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For steam and hot water boilers with cold water feed Continuous maintenance of minimum safe water level and independent of electrical service Proportional feed...

Mcdonnell & Miller

Mcdonnell & Miller Series 47/247 Water Feeders

BrandMcdonnell & Miller

CategoryWater Feeders

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For mounting in 21 2 NPT boiler side tappings Insertion lengths available in 13 16 41 8 (30-105mm) Packless...

Mcdonnell & Miller

Mcdonnell & Miller Series 69 – Built-In Low Water Cut-Offs

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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Quick hook-up fittings provided Lever-operated, full port ball valve for easy blow down Adjustable BX outlet for easy installation Dual precision switches for...

Mcdonnell & Miller

Mcdonnell & Miller Series 67 – Low Water Cut-Offs

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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Mcdonnell & Miller

Mcdonnell & Miller Make-Up Water Feeder Series 847

BrandMcdonnell & Miller

CategoryWater Feeders

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Monel bellows provides corrosion resistance Snap action switches for high temperature service 1 Single pole, single throw switch for pump control 1 Single pole,...

Mcdonnell & Miller

Mcdonnell & Miller Series 150S/157S Low Water Cut-Off/Pump Controller

BrandMcdonnell & Miller

CategoryCombination Low Water Cut Offspump Controllers

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For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m 2 ) capacity with cold water feed Quick-change replaceable cartridge valve and...

Mcdonnell & Miller

Mcdonnell & Miller Series 51/51-2 Mechanical Water Feeders/LWCO

BrandMcdonnell & Miller

CategoryWater Feeders

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For applications where water is added to steam separators, receivers, tanks, or other vessels Proportional feed action Quick-change replaceable cartridge valve...

Mcdonnell & Miller

Mcdonnell & Miller Series 551-S Make-Up Water Feeder

BrandMcdonnell & Miller

CategoryWater Feeders

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1 NPT Connection Two electrical knock-outs allows connection from either end Sensitivity adjusting screw makes flow adjustment easy Single pole, double...

Mcdonnell & Miller

Mcdonnell & Miller General Purpose Liquid Flow Switch, Series FS250

BrandMcdonnell & Miller

CategoryFlow Switches

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For high capacity [up to 35,000 sq. ft. (3250m 2 )] low pressure steam and hot water boilers with cold water feed

Mcdonnell & Miller

Mcdonnell & Miller Series 51-S/51-S-2 Mechanical Water Feeders/LWCO

BrandMcdonnell & Miller

CategoryWater Feeders

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For general purpose low velocity applications where the most economical flow switch is desired Paddle fits 8 (203mm) minimum duct size Two electrical...

Mcdonnell & Miller

Mcdonnell & Miller Series AF3 Air Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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Adjustable BX outlet for easy installation Dual precision switches for dependable operation of the low water cut-off and alarm or electric water feeder Packless...

Mcdonnell & Miller

Mcdonnell & Miller Series 61 – Low Water Cut-Offs

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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21 2 NPT body tapping for side mounting on boilers Lever-operated, full port ball valve for easy blow down Adjustable BX outlet for easy...

Mcdonnell & Miller

Mcdonnell & Miller Series 767 – Low Water Cut-Offs

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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Features and Benefits For tanks and hydronic heating systems Protects against over-pressure Minimizes hammering with flash steam Low differential pressure – 3 psi...

Mcdonnell & Miller

Mcdonnell & Miller Pressure Relief Valves

BrandMcdonnell & Miller

CategoryRelief Reducing Valves

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For industrial hazardous environment applications requiring a NEMA 7 (Class I, Division I, Group C and D) or NEMA 9 (Class II, Division I, Group E, F, and G)...

Mcdonnell & Miller

Mcdonnell & Miller Series AFE-1 Air Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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In-line configuration eliminates need for a pipe tee Sizes available 3 4 NPT 1 NPT Materials of construction Brass, carbon EPDM elastomer...

Mcdonnell & Miller

Mcdonnell & Miller Series FS5 General Purpose Liquid Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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Primary low water fuel cut-off protection and pump control for commercial and industrial steam boilers Motorized valve controller, low water cut-off, high water...

Mcdonnell & Miller

Mcdonnell & Miller Low Water Cut Off- Mechanical for Steam Boiler

BrandMcdonnell & Miller

CategoryCombination Low Water Cut Offspump Controllers

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Field-adjustable dwell-feed cycles Multi-color LED status indicator Manual feed button Hard-stop limit to minimize chances of flooding the boiler Compatible with...

Mcdonnell & Miller

Mcdonnell & Miller WFE Uni-Match® Electronic Feeder

BrandMcdonnell & Miller

CategoryWater Feeders

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For boiler receiver tanks Direct mounting eliminates need for equalizing connections Proportional feed action Mounting Flange six 7 16 ...

Mcdonnell & Miller

Mcdonnell & Miller Series 21/221 Make-Up Water Feeders

BrandMcdonnell & Miller

CategoryWater Feeders

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Brass with sealed tube construction Single pole, double throw snap switch Magnetic switching mechanism eliminates need for bellows Sensitivity adjusting...

Mcdonnell & Miller

Mcdonnell & Miller Series FS7-4W Industrial Liquid Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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For general purpose applications with medium and high velocity requirements Paddle fits 8 (203mm) minimum duct size, or 6 (152mm) if trimmed Brass,...

Mcdonnell & Miller

Mcdonnell & Miller Series AF1 Air Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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In-line configuration eliminates need for a pipe tee Sizes available 3 4 NPT 1 NPT Paddles available for low, medium or high flow Two electrical...

Mcdonnell & Miller

Mcdonnell & Miller Series FS4-3T General Purpose Liquid Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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The RB-24SE low water cut-off offers several features: Patented Self-Cleaning Probe minimizes scale build-up and extends recommended cleaning interval to 5...

Mcdonnell & Miller

Mcdonnell & Miller RB-24SE Low Water Cut-Off

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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1 NPT Two electrical knock-outs allows connection from either end Sensitivity adjusting screw makes flow adjustment easy Single pole, double throw snap...

Mcdonnell & Miller

Mcdonnell & Miller Series FS4-3 General Purpose Liquid Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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Heavy duty Includes No. 2 switch Optional manual reset available Maximum boiler pressure 50 psi (3.5 kg/cm 2 ) Use with TC-4 on hot water systems

Mcdonnell & Miller

Mcdonnell & Miller Series 63 – Low Water Cut-Offs

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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Heavy duty Adjustable BX outlet for easy installation Dual precision switches for dependable operation of the low water cut-off and alarm or electric water...

Mcdonnell & Miller

Mcdonnell & Miller Series 764 – Low Water Cut-Offs

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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Provides an air pressure signal proportional to the liquid level Available as Direct Acting or Reverse Acting A float operated armature senses the liquid...

Mcdonnell & Miller

Mcdonnell & Miller Series PFC Liquid Level Controls (M&M)

BrandMcdonnell & Miller

CategoryLiquid Level Controls

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1 1 4 NPT Brass with sealed tube construction Single pole, double throw snap switch Magnetic switching mechanism Sensitivity adjusting screw makes flow...

Mcdonnell & Miller

Mcdonnell & Miller Series FS7-4E Industrial Liquid Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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Lockout Delay CSD-1 Code Compliance Power Interruption Test Button Green Power On Red LWCO LEDs

Mcdonnell & Miller

Mcdonnell & Miller Series PSE-800-M Probe Type LWCO

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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In-line configuration eliminates need for a pipe tee High flow capacity 1 2 NPT Single pole, double throw snap switch Switch compartment is completely...

Mcdonnell & Miller

Mcdonnell & Miller Series FS1 High Sensitivity Liquid Flow Switches

BrandMcdonnell & Miller

CategoryFlow Switches

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Mcdonnell & Miller

Mcdonnell & Miller Series 64 – Low Water Cut-Offs

BrandMcdonnell & Miller

CategoryLow Water Cut Offs

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Frequently asked questions

Common questions about McDonnell & Miller from 3G Electric.

Does 3G Electric supply McDonnell & Miller products?

Yes — 3G Electric (S) Pte. Ltd. supplies McDonnell & Miller products. We stock the McDonnell & Miller catalog and supply genuine factory-original products with full manufacturer warranty and technical support.

What McDonnell & Miller products does 3G Electric stock?

McDonnell & Miller industrial equipment and spare parts for commercial and industrial applications.

Where can I buy McDonnell & Miller industrial equipment?

You can order McDonnell & Miller products directly from 3G Electric. Commonly ordered items dispatch quickly from in-stock inventory. For non-stocked models or custom configurations, typical lead time is 2–6 weeks direct from the McDonnell & Miller factory. Request a quote via our contact page for pricing and availability.