Self priming centrifugal jet pump with excellent suction capacity even in the presence of air bubbles. Suitable for pumping water with low levels of sandy impurities. Especially used in domestic water supply installations. Suitable for small farms and gardening, small scale industrial services and where self priming is necessary. Liquid quality requirements: clean, free from solid or abrasive contaminants, non-viscous, non-aggressive, uncrystallised and chemically neutral, close to the properties of water.