1The water-cooled motor has a long service life, with an anti-air lock designed and a moisture-proof seals. The heavy-duty motor has a stainless steel shaft and a sturdy thermoplastic body. 2All (automatic) bilge pumps are made of compact, rust and corrosion resistant stainless steel shafts, high impact resistance, durability and thermoplastic Abs plastic casing. 3Do not use any power source until the internal float switch activates the pump (water level rises). When the water level rises, the pump will turn on; when the water is removed, the pump will turn off. Spring filter, easy to clean. 4Compact, automatic, full submersible electric pump , stable and professional performance. 5Built-in float switch! (No separate float switch is needed). 6Equipped with built in electronic controlled reed sensor system for easy full automatic operation. 7Quick release strainer for easy maintenance, convenient for using. 8Extremely efficient, very low current, draw and offer high capacity output. 9Ignition protection to protect the pump against high current. 10Water/moisture tight seals, silent and vibrationless operation. 11Anti-airlock protection, and it will not burn out when run dry. 12Integrated float switch Test button at rear of unit. 13Can be used with switch panel for manual override. 14Includes comprehensive user manual with installation instructions and wiring diagram.