Self-priming centrifugal pump with 1 horse power motor that provides excellent suction capacity even when there are air bubbles. Particularly suitable for water supply in domestic installations, small-scale agriculture, gardening and wherever self- priming operation is necessary. The motor is made of cast iron, and it has a carbon/ceramic mechanical seal and has a built-in protection system to stop it when it is overloaded. It is designed to pump any liquid that is clean, free from solids or abrasive substances, not viscous, not aggressive, not crystallized and chemically neutral.