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Gorman-Rupp’s JS Series submersible pumps are excellent for submerged wet well installations with guide rails. These pumps are designed specifically for solids handling and incorporate several engineering features that prevent jamming and clogging, the two most common problems in pumping fluids containing solids. These models feature a semi-axial flow impellers that have a large free passage that will handle up to 5.5″ diameter spherical solids, depending on pump model. The impeller design has long screw-like vanes for handling long rags and other debris. Gorman-Rupp J Series pumps will operate at peak efficiency by maintaining the proper clearance between the impeller and volute. The impeller clearance can be adjusted quickly and easily by turning three external screws. No disassembly or replacement parts are necessary.