The plastic shrub head with brass pattern insert nozzle is an ideal solution for applications which require the spray nozzle to be above surrounding shrubs or flowers. The nozzles include an adjustment screw which allow you to reduce the spray pattern down to 75 percent of its maximum radius of 15 feet. The inlet threads are 1/2-inch female pipe thread (FPT) and the most common method of installation is on top of a 1/2-inch male pipe thread (MPT) rigid PVC riser. As plants grow you can extend the shrub spray head above the plants via addition of a Schedule 80 PVC coupling and another riser. The plastic shrub head with brass pattern insert nozzle is unique in that both the adapter which attaches to the riser and the spray nozzle itself are all brass construction. Machined plastic spray nozzles create extremely even water droplet size and distribution across the spray pattern. An additional advantage of the plastic adapter is that it is highly durable. You can replace the spray nozzle rather than replacing the entire head. The replacement nozzle is the same brass insert nozzle for flush heads. These shrub heads do not have pressure-regulating riser stems and are not for sale in California and other states which require pressure regulation. Recommended operating pressure is 30 PSI. For outdoor irrigation use with cold water only. Orbit 10-ft- 15-ft Quarter-circle Spray Shrub Head Sprinkler in Black | 54040D