Special Features: <br> Patio cantilever umbrella base sand/water filled square umbrella stand with 3D surface, made of durable HDPE material with excellent blow molding process, which is hard and weather-resistant, UV-resistant, waterproof, stable.<br> <br> More Information: <br> Material: HDPE material<br> Overall dimension: 33.27 '' L x 33.27 '' W x 4.72 '' H<br> The Weight of Filled with Wet Sand: 150 lbs<br> Number of water injection port：1<br> Number of water drain outlet：1<br> Diameter of water injection port：1.97inch<br> Diameter of water drain outlet: 1.18inch<br> <br>