... life-long self-absorption 2).ISO9001, ISO140001 WFB series of non-sealing self-control self-priming pump is to fill the gaps of the first ... leak, a substitute for a variety of long axis of liquid pumps, submersible pumps, submersible sewage pumps and other equipment for the best. ... more than 10 times. 3, transplant vacuum principle, self-priming performance, stable and reliable, in particular, used the ...