Protect your pool from getting damaged by ice during the winter months this year. Simply fill this tube with water and put it underneath your pool cover. This product will help alleviate the stress of ice expansion during the winter. Details: Blue with red valve 1ft. x 4ft. deflated size 2" valve opening diameter Winterizing pool pillow For in-ground pools only Valves fit most garden hoses Relieves stress of ice expansion Vinyl Easy assembly required