Rain Bird 1804-SAM-PRS 4" Sprinkler Sam-PRS 789961805915 Pressure Regulating Sprinklers are the best of the best and a perfect addition to the rotating nozzle of the R-Van or Hunter MP Rotators. The 1804-SAM-PRS do not come with nozzles, but we have thousands on hand and are happy to help you choose a nozzle. If you are looking for water efficiency, we sell the Rain-Bird rotating nozzles for R Van gearboxes. Rain Bird rotating nozzles provide water efficiency and design flexibility. With exclusive seal resists splitting, pressure and the environment. Made of durable plastic and corrosion-resistant stainless steel parts for durability. 4" Pop Up. PRS: Pressure regulator integrated in the stem. SAM: Seal-a-matic integrated check valve Exclusive design and high-quality workmanship combine to provide unmatched reliability, maximum compatibility and available water-saving features. The atomizer heads are made of durable materials, are extremely versatile and offer excellent performance so they can be used in a variety of applications. Install Rain Bird 1800 spray heads irrigation head on your next project and discover why they are number 1 in the world. Key Features: Patented system with sealed ziplock prevents water leakage and guarantees a long service life. 1/2 inch inlet size