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The Gianneschi CP - 20G - 230/400V is a Bronze CP Series Self Priming Liquid Ring Pump and Motor unit with Bronze Impeller, 3/4 Inch by 3/4 Inch Ports, coupled to a 0.37KW (0.5 Horsepower), 2800 RPM, 230/400 volts AC, 50 Hz Motor.
It is recommended that one install a clapet valve and filter with its suction pipe in order to prevent any backflow through the pump. The installer must pump water through it when rebooting or first initializing it in order to achieve the necessary suction for it to automatically prime itself.