Amarine-made Automatic Submersible Boat Bilge Water Pump 12v 2000gph Auto with Built-in Float Switch Compact, automatic, fully submersible electric pump Built-in float switch! (No separate float switch is needed) Equipped with built in electronic controlled reed sensor system for easy fully automatic operation No power use until pump is activated by internal float switch (when water level rises) Compact, efficient, long life motor ; Rustproof and corrosion resistant; Stainless steel shaft; High-impact durable plastic housing