Rule submersible bilge pumps have set the industry standards for quality. Designed with a silent, vibrationless 12V motor that will not burn out when it is run dry. This bilge pump is totally submersible with moisture-tight teflon seals and a protected ignition. Especially popular on smaller craft, Rule 500 pumps are unmatched in pumping power and longevity. 3/4" hose outlet.