1/2 HP pumps up to 3900 GPH at a 5' lift. Durable cast-iron base. Corrosion-resistant stainless steel fasteners. Replaceable piggy-back tether float switch for automatic operation. Oil-filled, thermally protected motor prevents overheating. Top suction screen filters debris. High capacity 1-1/2" NPT discharge. Will replace most submersible sumps without any plumbing changes. Designed for 14" diameter or larger sump basins. Pump will turn On when water level reaches 13" in the pit. Pump will turn Off when water level reaches 7" in the pit.0