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McDonnell Miller. 133400, Mechanical Water Feeder without quick hook-up fittings, 47-XFeatures For steam and hot water boilers with cold water feed Continuous maintenance of minimum safe water level, independent of electrical service Proportional feed action Quick-change replaceable cartridge valve and strainer Model 47 can be field upgraded with a No. 2 switch to add low water cut-off function Maximum water supply pressure 150 psi Maximum inlet water temperature 120F Maximum boiler pressure 25 psi SpecificationCategory Boiler Controls Series 47 Standards UL listed