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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 action
- Quick hook-up fittings provided
- Quick-change replaceable cartridge valve and strainer
- No. 2 Switch
- Model 47 can be field upgraded with a No. 2 switch to add low water cut-off function
- Maximum water supply pressure 150 psi (10.5 kg/cm sq.)
- Maximum inlet water temperature 120 degrees F (49 degrees C)
- Maximum boiler pressure 25 psi (1.8 kg/cm sq.)
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