KB Series water pump unit is self-priming single-stage centrifugal water pump which being driven by air cooled diect injecting 4-stroke diesel. The shell-body adopt aluminum alloy diecasting, machinery type seal device, and the material of moving ring is ceramics, and the material of static ring is graphite, so this machine is compact in structure. light in weight, small in size and beautiful in appearance, convenience for operation, easy maintenance, and able to stand wear and tear.