... certification 2.Produced by German KAMAT technology 3.Medium is water or oil 4.Change plunger is simple,quick. General parameters ... ratio:i=4.0435.Motor power:75,90,110KW6.Medium:water or oil7.Material of liquid end: Carbon steel, SS420, SS304 ... , low noise.If you have any questions,please feel free to contact me. Plunger water pump