... 3.self --priming pump Features:Property:WFB series non - sealing self - control and self - priming pump, fills the ... : The product is widely used in the fields of electronic, electrical, chemical, metallurgy, medicine, food, electroplating, environmental protection, fire ... advantages:1.We applied the "multi - faceted type centrifugal sealing device", which get rid of traditional filling seals, packing ...