Used for farmland irrigation, garden spraying, vegetable greenhouses water supply and aquaculture water supply and drainage, as well as well with water, tap water pressurization and other household automatic water supply occasions, the injector installed in the inlet pipe inlet end, greatly improve the suction range of the pump. Features: convenient installation, exquisite structure, high head, suction is also high, suitable for conveying temperature not more than 60℃ water, pump working environment temperature not more than 40℃. The suction range of XDP-255 is 25m, that of XDP-375 is 28m, and that of XDP-505 is 40m.