... 4. OEM 5.ISO9001,export entitlement water impeller1. Copper casting, brass casting, sand casting, die casting, gravity, high pressure die casting, low ... 4. Surface finish process: polishing, sand blasting, heat treatment, painting, powder coating, anodizing, electroplating, mirror polishing.5. OEM service available.6. Good quality ... to service you, our skype:donytrade High quality 3 inch water impeller