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Mcdonnell & Miller Series 767 – Low Water Cut-Offs - Low Water Cut Offs
Mcdonnell & MillerLow Water Cut Offs

Mcdonnell & Miller Series 767 – Low Water Cut-Offs

Note: listed by manufacturer as obsolete/discontinued.

SKU 3G-OTH-02746

Brand
Mcdonnell & Miller
Item
Series 767 – Low Water Cut-Offs
Part Number
767
Category
Low Water Cut Offs
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Payment
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Mcdonnell & Miller Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

Note: listed by manufacturer as obsolete/discontinued.

Frequently Asked Questions

What is the McDonnell & Miller 21 low water cut-off used for?

The McDonnell & Miller 21 is a low water cut-off used on steam and hot water boilers to shut down the burner if water level drops below safe limits. It features a lever-operated full port ball valve for blow down and an adjustable BX outlet for wiring.

What are the specifications of the McDonnell & Miller 21 low water cut-off?

The McDonnell & Miller 21 has a 2-inch NPT body tapping for side mounting on boilers. It includes a lever-operated full port ball valve for blow down and an adjustable BX outlet. Note: the manufacturer lists this model as obsolete/discontinued.

Where to buy the McDonnell & Miller 21 in Singapore?

3G Electric supplies the McDonnell & Miller 21 low water cut-off to Singapore. We source and deliver this item, handling logistics and customs clearance. Contact us for availability and lead time.

How to install the McDonnell & Miller 21 low water cut-off?

Install the McDonnell & Miller 21 by mounting it on the boiler side using the 2-inch NPT tapping. Ensure the blow-down valve is accessible for periodic maintenance. Wire the adjustable BX outlet per local codes. Always follow the manufacturer's instructions for safe operation.

Used in

Common applications for Mcdonnell & Miller
Boiler systems — McDonnell & Miller FS4-3T3-1 flow switch for low-water cutoff and pump protection in 1-inch piping.
Pump control — McDonnell & Miller FS8-W flow switch for detecting flow in 1-inch lines to prevent dry running.
HVAC cooling water — McDonnell & Miller FS6-3/4 flow switch for monitoring flow in 3/4-inch chilled water circuits.
Process piping — McDonnell & Miller FS5-3/4 brass flow switch for hot water applications up to 250°F.
Industrial liquid monitoring — McDonnell & Miller FS6-W-1 flow switch for 1-inch lines with high locked-rotor rating.
Small pipe systems — McDonnell & Miller FS-1 flow switch for 1/2-inch lines in liquid circuits requiring flow detection.
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Mcdonnell & Miller Products

3G Electric supplies Mcdonnell & Miller low water cut offs. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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

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