... and back pull-out design gland seal mechanical seal KWP series sewage pump is characterized by high-efficiency, no clogging, rear dissembling ... structure and convenient maintenance and overhaul; there are a variety of impellers ... ,KWPK250-315,KWPK250-400,KWPK250-500KWPK250-630,KWPK300-400 KWPK centrifugal water pump