RB-24E Low Water Cut-Off - McDonnell & Miller Features and Benefits 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 enable secure installation without damage to the housing. McDonnell & Miller’s patented self-cleaning probe minimizes scale build-up and extends the recommended cleaning interval to 5 years. RB-122-E – Low Water Cut-Off - McDonnell & Miller McDonnell & Miller. McDonnell & Miller is a leader in engineering and manufacturing boiler controls, liquid level controls, low-water cutoffs, and flow switches for steam and hot water boilers in industrial, commercial, and building trades applications.
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