1/2" SHAFT ZINC FOR DE-ICERS. Designed to prevent ice formation around boats, marinas, floating docks, piers, pilings, boat houses, bulkheads and fish and duck ponds. The propeller draws up warmer subsurface water and deflects it to the surface creating a constant circulation of warmer water that prevents ice formation. Will melt existing ice. Just cut a hole and lower the unit into place.
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