Water jet pump
The water jet pump is a self-priming pump which has no moving parts. See Fig. 1 Water jet pump

Fig. 1 Water jet pump: Schematic 1 Motive, 2 Nozzle, 3 Diffuser, 4 Body, 5 Fluid handled
It is often also used as the priming stage for pumps of lower ratings such as garden pumps or domestic water supply systems. It operates in the same way as a eductor-jet pump.
