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Best Efficiency Point Full Impeller: 3600rpm 550GPM @ 550FTH | 1800rpm  250GPM @ 130FTH | SF18105 Standard Bore Cartridge Seal C/SC/V/316SS 316SS PUMPS HAVE A 316SS CASING, STUFFING BOX COVER, IMPELLER, AND SLEEVE; AND A 4140 SHAFT. -
Best Efficiency Point Full Impeller: 3600rpm 550GPM @ 550FTH | 1800rpm  250GPM @ 130FTH | SF18105 Standard Bore Cartridge Seal C/SC/V/316SS IRON / SS PUMPS HAVE AN IRON CASING AND STUFFING BOX COVER; A 316SS IMPELLER AND SLEEVE; AND A 4140 SHAFT.