Patio Umbrella Base with Wheels, Water & Sand Filled Weighted Base for Most Cantilever Offset W1859P304053Movable Umbrella Stand: This base weight features four flexible wheels for easy sliding across your backyard, garden, or deck without scratching floors. Easy to Fill and Drain: No need for assembly. there are 2 inlets on the top for filling with water sand, and 2 outlets on the side for draining the filling. Fill with at least 50% sandand inject 260 pounds of water. Ultra Durable PE Material: Made of durable PP plastic for weather resistance and UV