Refillable Half-Round Patio Umbrella Base, 55 LBS Mixed Fill Capacity for Secure Stability 93660627Secure Weighted Stability: This patio umbrella base features a refillable reservoir that can be filled with 37 lbs 17 kg of water, 48 lbs 22 kg of sand, or 55 lbs 25 kg of mixed sand and water, providing secure support to keep your umbrella firmly. Plus, the large top fill port and leak proof plug make filling easy. Universal Umbrella Compatibility: The heavy duty umbrella stand includes 2 adapters, which is suitable for patio umbrella poles of 1. 57"