The pump uses the movement from the water and your boat to gently pump water from the bilge. The pump has a self-priming lift of approximately 67 inches. This lift is measured wherever the hose is in a vertical position and then strung over the side.
The bilge pump's ability to self prime itself will begin to remove water whenever it appears; pumping up to 15 gallons per hour. The pump will continue to work 24 hours even if the boat is dry.
  Heavy Duty Brass
Polythene Coated Steel
PVC Tubing
Expanded Polyvinylchloride
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See
a diagram of the pump
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"Lee & Bob... Thanks for asking about the pump. I bought it at the boat show about 15 years ago from a guy who was importing them from Norway. He's no longer around but the following web site has them (and a good description):
http://www.jrsupplies.com
She also has a sub-distributor around Cape Cod.
The pump has been great for me. It's an hydraulic piston the size of a small bicycle pump with a moving float, hung over the fantail, with a suction tube running thru the lazarette down to the bilge. Wave action on the styrofoam float pumps the piston which sucks the water from the bilge. Absolutely reliable and keeps the bilges dry. Obviously it won't work in a quiet protected anchorage as I was reminded during the fall cruise when we woke in Harrison's Marina with water to the bottom of the batteries from blown packing. But my normal mooring off the Severn gets plenty of wave action to keep the pump pleasantly perking..." Robert Kirk
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