Rain Bird 22SAH Mini Rotary Pop-Up Spray, 180&deg; Half Circle Pattern, 18' - 24' Spray Distance, 4" Pop-up Height 180 half circle pattern rotary sprinkler head with 4" pop-up height Reduces water use up to 30% over pop-up sprinklers Multiple rotating streams gently distribute large droplets to water uniformly and resist windblown overspray Slow distribution rate of 0.6 inches per hour is ideal for newly seeded areas, slopes and hillsides Extended 18' to 24' throw covers more area with fewer sprinkler heads to reduce system complexity Pressure-activated wiper seal and closed case design protect mechanism from creeping grasses and sandy soil