A simple twist of the centre collar with no special tools increases or decreases arc setting, making it ideal for watering odd-shaped areasQuickly identify radius with Top Color-coded™ nozzles, even when system is not operating12, 15, and 18-VAN have matched precipitation rates with Rain Bird MPR nozzlesEasy arc adjustment from 0° to 360° for 10-, 12-, 15-, and 18-VAN; 0° to 330° for 4-, 6- and 8-VANThe textured base and collar are easy to grip, even when wetA physical left edge indicator makes it easier to feel the fixed left edgeStainless steel adjustment screw to adjust flow and radius"Captured" screw slot prevents screwdriver slippage during adjustmentBlue filter screen (.02" x .02") (shipped with nozzles) maintains precise radius adjustment and prevents cloggingFits all Rain Bird sprinklers and shrub adapters Spacing: 3 to 18 feet (0.9 m to 5.5 m)*Pressure: 15 to 30 psi (1.0 to 2.1 bar)Optimum pressure: 30 psi (2.1 bar)*** These ranges are based on proper pressure at nozzle** Rain Bird recommends using 1800 PRS Spray Bodies to maintain optimum nozzle performance in higher pressure situations Please click here for technical specs.