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Description
4-Pack Blue 4 ft. Single Chamber 16 Gauge Pool Cover Water Bags.Heavy-Duty 16 Gauge Vinyl Construction - 30% Heavier Than Industry-Standard.Single Chamber Design For Easy Filling.Prevents Winter Pool Cover From Falling Into Pool.Fill Halfway With Water to Allow For Ice Expansion - If you have trouble closing the valve please use a hair dryer to loosen before closing.