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De-icers push warm bottom water to the surface creating an ice-free area of protection around your boat, dock, pier, or other in-water property. They help protect fish and aquatic species, by allowing for open areas where oxygen can enter the water. Kasco de-icers come with (2) 20 ft. suspension ropes. Use de-icers year-round for improved health and beauty of your water.Open Water Diameter varies depending on temperature and orientation (Angled or Vertical). See Kascomarine.com for additional sizing information. ETL approved to CSA and UL standards3 year limited warrantyIncludes Mooring lines for suspended operation