The Rain Bird 4" Pop-up Spray Head Sprinkler with High-Efficiency Variable Arc Nozzle is constructed of time-proven UV-resistant plastic and corrosion resistant stainless steel parts, assuring long product life. Strong stainless steel spring provides reliable stem retraction. High Efficiency” adjustable nozzle is up to 40% more efficient than other adjustable nozzles. Resists wind-blown overspray and reduces watering run times.