Steady operation: Shaft and impeller is homocentric so that pump can operate steadily and without vibration. No leak: Hard alloy mechanical seal of different material for different liquids Small noise: Two bearings with little noise support the pump. Little troubles Single structure and fluid parts with high quality prolong the life of pump. Convenient maintenance It is easy to replace the seal and bearing etc. Smaller occupancy of location Outlet can be toward left and right and upon direction to plan pipeline