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McDonnell Miller flow switch is available in airflow and liquid flow as options.  McDonnell Miller low water cut-off helps to protect steam and hot water boilers from the hazards of a low water condition. McDonnell Miller valve is used to control liquid levels, water feeders, and flow switches. McDonnell Miller water feeder is used for low-pressure steam boilers with cold water feed. It eliminates the necessity to manually add water to the boiler