Air Driven "Sludgemaster" Trash Pump from Warren Rupp. This submersible, air-powered pump is ideal for transfer of trash-laden water with mud, leaves, sand, sludge and soft solids to 1-1/2". Maximum flow to 300 GPM. Sturdy aluminum housing and ductile impeller for rough handling and long life. Discharge port is 3" FPT. Fits through a 14" diameter opening. Optional rock screen available.