Construction materials: 1) Impeller: engineering plastics resisting the high temperature 2) Pump body: cast iron / brass 3) Shaft: steel 2Cr13 4) Bearing: pottery / stainless steal Performance parameter: 1) Head: 4m 2) Rotated flow: 0 - 3.0m3/h 3) Length of body: 130mm / 180mm 4) Three speed 5) Input power: 60W 6) Output power: 20W