... ISO140001 WFB series of non-sealing self-control self-priming pump is to fill the gaps ... of the first product, the product has a temperature, pressure, wear, "one drainage," "life-long self ... 10 times. 3, transplant vacuum principle, self-priming performance, stable and reliable, in ... valve", truly a "one-draining, life-long self-priming." 4, little vibration, low noise, ...