Compact size. Mechanical float switch allows installation in sump pits as small as 11" diameter. Glass reinforced thermoplastic pump housing will not rust or corrode. Heavy duty oil-filled motor is thermally protected. Glass reinforced poly-carbonate impeller is designed for years of use. Top suction strainer filters debris. Stainless steel fasteners for corrosion-resistance. High capacity 1-1/2" NPT discharge. on level at 9", off level at 4". Pumps up to 3900 gph at 0'.