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The RAINBIRD NATIONAL SLS 1804FDSP25 is a 4-inch 1800 Professional Series pressure-regulating (PRS) pop-up spray head designed for residential and commercial irrigation systems. The unit features a patented Dual Spray nozzle that delivers close-in watering coverage alongside standard spray, promoting uniform distribution and reducing dry spots. A 1/2-inch inlet connects to standard lateral lines, and the head pops up to expose a full 360-degree spray pattern reaching up to 15 feet. Licensed irrigation contractors and landscape professionals install this head as part of fixed-spray zone layouts. This package contains 25 heads.
The 1804FDSP25 is suited for turf and groundcover zones in residential and light commercial landscapes where consistent pressure and uniform coverage are critical. The built-in pressure-regulating stem helps maintain performance across zones with varying inlet pressure, which is especially valuable on systems with elevation changes or long runs. Use of PRS heads is required by code in California, Washington, Hawaii, Colorado, and Vermont, making this unit a code-compliant choice in those states. The 360-degree full-circle nozzle pattern is intended for center-field placement away from edges or borders.
Designed as an OEM-style replacement or new-install pop-up spray head for standard 1/2-inch threaded irrigation lateral lines in residential and commercial fixed-spray sprinkler systems.
Installation is performed by licensed irrigation contractors or qualified landscape irrigation technicians. Shut off the irrigation system water supply and depressurize the lateral line before threading the head onto the riser or swing joint. Hand-tighten the inlet connection to avoid cracking the body, then verify nozzle alignment before backfilling. Local codes in California, Washington, Hawaii, Colorado, and Vermont mandate the use of pressure-regulating heads on spray zones; confirm applicable requirements before installation.
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