Agricultural centrifugal pump：The shaft material is 45 × carbon structure, the rest of the parts are gray casting, and the shaft seal adopts oil seal device.
Marine centrifugal pump：The materials of shaft, shaft sleeve, impeller cap and internal fastener of the pump are changed to stainless steel or cast brass, and the rest are the same as that of the machine sealed clean water pump.
Marine seawater pump：The materials of impellers and machine casings (some products) are changed into precision cast stainless steel, the cast iron sealing rings are changed into stainless steel machine sealing rings, and the rest are the same as machine sealed marine pumps.
