... worn through. And furthermore, even the volute liner breaks, no water leakage will occur. WNQ sump pump is single casing, single ... and cantilever. Fir its frame type, it is oil or water lubricated. 2,Easy for disassembly and maintenance WN(Q) ... identical replacement period, resulting in a low cost for maintenance. 7,Low water consumption, High efficiency and low power consuption The pumps is very ...