Ensure your patio umbrella stays stable with this refillable umbrella base. Designed with a large reservoir, it can be filled with 4.9 gallons of water, 51 lbs of sand, or 66 lbs of a sand-water mix for optimal stability. Made from high-strength Hdpe material, it resists weather and sun damage. The base features a groove for easy storage, a built-in handle for portability, and a simple setup process. Perfect for both residential and commercial use, it fits patio umbrella poles up to 1.5".