... is without bubble or metal peel.)The feature of water pump impeller1. Workpiece surface smooth, the transition smooth without cracks, creases ... data -0.25~+0.25.4. Coated with anti-rust oil after cleaning the surface.5. Impeller and bearing tight fit ... can be galvanized and so on. Applied Range of water pump impellerWidely used in Auto Industry,petrochemical industry,pharmacy,food wine ...