Best Seller | Coolaroo Umbrella Waterbase Plastic/Resin in Black | 3 H x 19.75 W x 19.75 D in | Wayfair 474751 Universal Umbrella Water Base comes 4 to a set and works with any umbrella that uses a conventional flanged cross brace base. They are designed to be filled with either water or sand which provides the additional weight required for umbrella stability... more | | $93.44 FREE shipping go to store |