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IP55 Water Pump Frequency Converter Sw100 for Constant-Pressure Water Supply System. IP55 protection, cast aluminum heat dissipation for stable performance. RS485 networking, support up to 4 pumps parallel with auto sleep. Full protections: dry-run, water shortage, overvoltage, overheat etc. Built-in anti-freeze function ensures winter pump safety. Real-time LED pressure monitoring, easy parameter adjustment.