Centrifugal self-priming pump with high suction capacity also when air bubbles are present. Suitable for use with water with small sandy impurities. Particularly suited for water supply in domestic systems: circulation of aggressive water in general, containing chlorine (swimming pool water). Pumped liquid: clean, free of solids and abrasives, non-viscous, non-aggressive, non-crystallised and chemically neutral, with properties similar to water.