High performance self-priming monobloc pumps for public swimming pools and clean liquids recirculation. The hydraulic body, impeller and diffuser manufactured in cast iron. The shaft and the mechanic seal are made of stainless steel AISI-316. Includes a prefilter with a polypropilene basket. The motor holds an IP-54 protection. The gamma ranges from triphasic 2 HP to 5.5 HP motors. Such motors have a 230/400/690V 50Hz working voltage (60 hz could also be supplied). For the 2 CV motor, 24/42V is also avaiable.According the Energy Efficiency regulation class IE2