“CASING RING MATERIAL: SYNTHETIC RESINNANIWA.FEV-200-D.020 “CASING RING MATERIAL: SYNTHETIC RESINNANIWA.FEV-200-D.021 “IMPELLER MAX. SI : 2.0, MN : 2.0, CR : 20 MATERIAL: STAINLESS STEEL – ASTM CF8MNANIWA.FEV-200-D.003