Air driven sump pump. No fuel tanks, electrical connections or burned out motors to worry about. Mud, leaves, twigs, bilge gunk and sewage,...when trash like this collects and clogs up the work site, this pump can easily be submerged into the mess, and won't quit until the site is dry. Pump weighs 48 lbs and has a 2-1/2" discharge with a basket style inlet strainer cover which prevents twigs, stones leaves and other debris from entering pump. This pump will discharge 235 GPM at about 40 feet of head.