... with open impeller, the max. dia. of particle could reach 19mm BK series stainless steel centrifugal pumps with semi-open ... and shaft are made of SUS304 or SUS316, with features of exchangeable components, stable quality, small size ... induction motor, aluminum alloy motor case, single phase with thermal protector, Class F or B, Protection IP54 ... .511.5108 Stainless Steel Pumps with Open Impeller