... cast in one piece.Shielded, grease lubriated ball bearings do not need any Maintenance. Unbalanced standard mechanial seals (silicon carbide-carbon-vition). ... Flanges are according to UNI 2223 PN 16MATERIAL:Standard construction is: Casing and Impeller in cast iron. Shaft ... Three phase induction Motor, Protection IP55, insulation class B. Standard voltage is 220/380V, up to 3KW(4HP), 380/ ...