Magnetic drive pump, designed to run continuously, without seals to wear out. Highly energy efficient. Being filled with epoxy, not oil, they cannot leak oil into the pond. Features include, O-Ring seal, Standard NPT thread, ABS case, magnetic impeller assembly, heavy duty copper winding and corrosion proof fasteners. Built-in adjustable flow control (except the PM250). Includes rigid pre-filter, ceramic shaft and 18ft grounded power cord. Operates submerged or inline. UL listed/certified.