... -out design gland seal mechanical seal KWP series sewage pump is characterized by high-efficiency, no clogging, rear dissembling structure and convenient ... , O-type Open, F-type free flow, E-type single-vane and Ex-type widened-flow route single vane impeller); the horizontal ... ,KWPK250-315,KWPK250-400,KWPK250-500KWPK250-630,KWPK300-400 KWPK centrifugal water pump