... 't bottom valve, sewerage water with soft solid and fibre, Self-priming sewerage non -clogging pumpApplicationMine, Municipal Engineering and Industrial waste water ... steelShaft: Stainless steelSeal: Mechanical sealDescription Sewerage pump ZW pumps are self-priming sewerage non-clogging pump, It needn't bottom valve, It ... for hours of continuous operation if driven by diesel engine. Self-primming pump