Abstract: Weight, particularly suited for use in irrigation systems, includes a body having a chamber with inner and outer walls. The chamber is sized and configured for receiving a fluid such as water, storing the water in use, and adding to the weight of the overall device. The unfilled weight is lightweight when empty for shipment, and relatively heavy, in use. A portion of water coming into the weight is diverted, such as when irrigating a field and the weight is connected to an irrigation line. Such diverted water fills the chamber and increases the service weight. The weight may include an outlet configured for attaching to an irrigation sprayer head. When the flow of irrigation water is stopped, the weight retains some water, maintains the desired service weight, and prevents undesired movement of the weight and associated sprinkler head.