The AQUALYJETDP-505A/750A pumps are  regards as one of the best surface pumps for deep well water priming,with two back to back impeller to gain good performance in suction and head putput. it consists of two pumps connected in series .one is ejector pump and the other is centrifugal pump.The ejector pump is lowered in a 4" well and connected to the centrifugal pump body by two pipes.For working principle.please refer to the pipe connection below.

Usually,these pumps are used with a set of TANK-auto system include the tank,the pressure gauge,the pressure switch,the foot vavle,etc.,The tand-austo system is another most significant merit of this pump,which make the pumps more convenient for using.

These pumps are suitable for pumping clean water and chemically nonaggressive fluid.They are extremely reliable,economical to use in domestic applications,To ensure adequate counter-pressure,It is always better to install a fool valive with a filter on the suction end.These pumps should be installed in a covered area,protected against the weather.