Centrifugal pumps designed according to ANSI B73.1 standards for abrasive and corrosive fluids. Constructed from cast iron, stainless steel, duplex, Hastelloy, or titanium. Shaft sealing with single mechanical seal, double seal with cartridge option, packing, or centrifugal seal. Retracted vortex impeller design facilitates the passage of solids and fibers up to 75 mm in diameter. The concentric volute design ensures reliable operation at low flow rates. Bearing housing in oil bath. Back pull-out configuration allows the rear section of the unit to be removed without the need to disassemble the piping.