Rain Curtain Nozzle Technology - Rain curtain nozzles standard on all 5000 series rotors, large water droplets for greater wind resistance, effective close-in watering, even distribution over the entire radius; Tree of nozzles including four low angle (10 degrees) and eight standard angle Rain Curtain Nozzles (25 degrees) provides 25' to 50' distance of throw; Self-aligning nozzles. Installation and Maintenance - slip clutch mechanism for quick adjustment on installation; Faster maintenance with a new self-cleaning arc adjustment screw; The 5000 Plus features a flow shut-off device to stop the flow of water to a particular head while the system is still in operation; Top-adjust arc adjustment requiring only a flathead screwdriver; Radius adjustment screw allows up to 25% radius reduction without changing nozzles. Design Solutions - 5000 series available in Shrub, 4", 6" and 12" models with optional stainless steel stems; Award-winning MPR nozzle set simplifies design and installation by providing matched precipitation from 25' and 35'; Standard rubber cover for extra protection, 5000 series features a green cover while the 5000 series features a black cover; 40-360 degrees arc rotation and reversing full-circle rotation in one (a non-reversing full-circle only unit is also available); True 4", 6" and 12" pop-up (measured from the cover to the nozzle). Durability - heavy-duty cover assembly for extra durability in residential or commercial applications; Heavy-duty retract spring assures positive pop-down; Pressure-activated triple-blade multi-function wiper seal protects internals from debris and assures positive pop-up and retraction; Additional O-rings and seals for extra protection in "gritty" water.