... tungsten carbide O-ring:EPDM/vitonFeature:1, using a unique double channel non-clogging impeller structure, improve the sewage overcurrent ... into two. Stir, mix and water are not interaction.4, double-end face mechanical seal, long-term in the oil chamber,ensure ... overload to heat,protector makes action in time, cut off power supply automatically, so that after cooling the motor automatically operates ...