NRS Bilge Pump
Wrapped with foam so it floats, this little pump can move 30L (8 gallons) a minute. You don't need a hose - just stand the end of the pump in the bottom of your boat and the water will spray out over the side. You don't need to worry about rust, either - the pump is made of tough plastic and the hardware is stainless steel.
Dimensions: 53cm /21" long