Rain Bird SP40H matched precipitation rate 4" Sure Pop sprinkler, 180 half circle pattern with adjustable 8' to 15' spray distance, 4" pop-up height. From the Manufacturer: Rain Birds line of Sure-Pop sprinklers features a complete selection of pop-up spray heads for watering shrubs, small lawns and other irregularly shaped planting areas. Where precision watering is key, Sure-Pop sprinklers offer head-to-head coverage even in configurations where larger heads produce overspray and waste. The affordable Sure-Pop series offers Rain Birds patented pop-up mechanism for watering and out-of-sight retraction into the lawn when not in operation. Patented stem seal keeps debris out, prevents pressure loss from flow-by and ensures pop-up at low water pressure. Simple top adjustment screw allows reduction of watering spray distance by up to 25%. No tools needed to change nozzles and operates efficiently at low water pressure. 2-1/2" or 4" pop-up heights are available for different types of grass varieties. All models feature a 1/2" inlet size and include matched precipitation rate (MPR) nozzles allowing sprinklers with various arcs to be mixed within the same zone, providing an equal amount of water. Eight assembled patterns available including: 360 Full Circle, 180 Half Circle, 90 Quarter Circle, End Strip, Center Strip, Side Strip, Square, and 0 to 360 Adjustable. Rain Bird The Intelligent Use of Water