The new Orbit Professional Series 4 in. Spray Head brings rugged elegance to the irrigation market. It is ideal for use in residential and commercial landscapes, and handles the most intricately designed, high maintenance areas with ease. Professional Series 8 ft. Adjustable Pattern Nozzle provides uniform coverage and long lasting performance. There are two seals on the cap, a radial seal and a face seal. There are two more seals on the riser making leaks a thing of the past. A pre-installed pressure regulator delivers a constant 30 PSI - the precise pressure at which spray nozzles operate best. Delivers even, and consistent water coverage over a nozzle's radius. No over spray or misting due to an over pressurized system.