Often, when an irrigation system is designed, it can be a real challenge to water those hard-to-reach spots. The MP Rotator?,,? from Walla Walla Sprinkler Company is a matched precipitation sprinkler for turf and landscape that installs into any spray body or shrub adapter with a male-threaded stem. At any arc and any radius there is matched precipitation without changing a nozzle. There are three arcs for each model. There is a 360-degree full circle arc, a 90-degree arc, adjustble to 210-degrees, and a 210-degree arc, adjustable to 270-degrees. This product replaces the spray nozzle on a conventional pop-up spray-head, or it can mount on a fixed riser with an adapter, fitting only heads with male thread pop-up stem. It uses 1/3 of the water flow of a conventional spray head, meaning that lower flow makes larger zones possible. A lower precipitation rate also means there is less runoff. The lower trajectory stream angle provides for increased wind resistance. There are two models of the sprinkler: MP2000, with a radius = 4.5-6.3 M and the MP3000 with a radius up to 9 M. The benefits of these include a performance range that can solve irrigation problems and they fill the gap between spray heads and gear drive rotors. A low application rate at the head to head spacing means there is less runoff; it can be mixed with gear drive rotors, and it has fewer valves-per-system. There is a matched precipitation rate at any arc or radius at the head to head spacing. This means an adjustable arc radius with matched precipitation reduces the need to change nozzles. This product also features high uniformity. High on-site uniformity is achieved through the use of wind-fighting streams, sweeper streams, and the lack of misting at high pressure. Tight soils and slopes can be irrigated properly using this because of the low water application rate, and multiple rotating streams deliver a lower instantaneous application rate than a single stream rotator. During short duration irrigation cycles, multiple streams apply more even coverage than do single stream rotators. The product has four essential parts that anyone using it should know aobut. It features a radius adjustment screw, a Left Edge Indicator which shows that the spray arc is clockwise from the mark (indicator). There is an arc adjustment ring, which is pretty self explanatory, and an inlet screen. To clean the inlet screen, one just has to simply snap off the inlet screen, flush with water, and snap the screen back into place. The manufacturer also advises that the system not run without the inlet screen back in place. It?EUR(TM)s also fairly simple to operate and adjust. For arc adjustment, there is a factory setting for minimum arc on all models. The full-circle model does not have an arc adjustment. The Left Edge Indicator should be positioned to the left side of the watering area. Once the water is turned on, and the Rotator in the pop-up position, the arc can be adjusted at the arc adjustment ring. Clockwise increases the arc, and counterclockwise decreases the arc. The arc cannot be adjusted when the adjustment ring is in the pop-down position. There is a factory setting for full radius. With a flat-bladed screwdriven the screw can be rotated clockwise to decrease the radius and counterclockwise to increase the radius. The radius can be reduced by approximately 25-percent of full radius. This company is a subsidiary of Nelson Irrigation Corp. which produces water applications for the agricultural irrigation market. Back in the 1980s Nelson saw it was time for a change, and set out to completely redesign the impact sprinkler. The result was an entirely new drive mechanism and component organization ?EUR? the Rotator?(R) sprinkler was born. This plastic creation simplifies the water propulsion method by limiting the moving parts to one. How the Rotator?(R) Works: The water stream emitted from the nozzle is directed into an offset channel on the rotor plate, which creates a reactionary drive force. A viscous silicone fluid in the rotor motor controls the rotation speed. This precise and simple design solves many of the problems that the impact sprinkler faces. More uniform water distribution patterns can be achieved, reliability is enhanced, application rates are reduced, costs and maintenance are lowered, and riser vibration is eliminated. The Rotator?(R) sprinkler is the perfect sprinkler for solid-set, wheel-line, permanent set and portable systems. Since the development of Rotator?(R) technology, a whole line of sprinklers have been developed. The R5, R10, R10Turbo, R2000, and R2000WF. Now the landscape industry has it?EUR(TM)s own rotator as well with the matched precipitation sprinkler.