Rain Bird 1800-PRS Series Spray Heads are ideal for use in areas with high and/or widely fluctuating water pressures. The patented PRS pressure regulator built into the stem saves water by maintaining optimum water pressure for ideal spray nozzle performance. It also helps to end misting and fogging caused by excessively high water pressure. Trusted for over 30 years, 1800 Series Spray Heads have provided unmatched durability, reliability, and performance. Superior components and features make the 1800 Series Spray Head the spray head of choice for a wide variety of applications.