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<br />Matched Precipitation Rotators (MP rotators): A multi-stream rotor the size of a <br />spray nozzle. It fits any conventional spray head body or shrub adapter, transforming it <br />into a high uniformity, low application rate sprinkler with matched precipitation, even <br />after arc and radius adjustment. The MP Rotator's low application rate helps to <br />significantly control runoff on slopes and tight soils. (http://www.mprotator.com/) Many <br />cities offer rebates for MP rotators. <br /> <br />Nipples: Short pieces of pipes that are threaded on both ends that connect the sprinkler <br />heads to the lateral pipes. (Rain bird CD-ROM, What is an Irrigation System?: Irrigation <br />Components). <br /> <br />Nozzle: The part of a sprinkler that the water comes out of. Usually a very carefully <br />engineered part to assure a good spray pattern. In most cases the nozzle is removable so <br />that it can be easily cleaned or replaced. With plastic nozzles replacement is generally <br />preferred over cleaning as small scratches in the plastic can cause big problems with <br />water distribution uniformity. Available in many different spray patterns and throw radii. <br />Spray head nozzles contain: orifice(s), filter screen, radius adjustment screw <br /> <br />Nozzle Trajectory: The angle at which water leaves the nozzle, relative to the ground. <br />Low trajectory nozzles are useful in areas of high wind or with large slopes. (Rain bird <br />CD-ROM: Intro to spray heads) <br /> <br />Orifice: The opening in the nozzle where the water actually comes out. Sprinkler head <br />nozzles can have one orifice or several orifices. (Rain bird CD-ROM: Intro to spray <br />heads) <br /> <br />Outlet port: The downstream side of the valve where water flows out to the lateral <br />pipes. (Rain bird CD-ROM: What is an Irrigation System?: Components). <br /> <br />Pilot Plunger: The part of the valve, that when activated, raises to allow the water to <br />escape from above diaphragm. When it is not activated, it remains lowered and traps <br />water above the diaphragm. (Rain bird CD-ROM: What is an Irrigation System?: <br />Components). <br /> <br />Point of Connection (POC): The place where the irrigation main taps into the property <br />main's water source. The POC can connect to a service line, well, pond or other type of <br />water source. (Rain bird CD-ROM: What is an Irrigation System?: Components). <br /> <br />Polyethylene (poly) pipes: Usually black and are much more flexible than PVC pipes. <br />Poly pipes are connected using barbed fittings and clamps and do not require glue. Poly <br />pipe is often used in places that have rocl<y soil because of its flexibility. It is also used <br />in areas with harsh winters because it resists freezing better than PVC. Poly pipe is <br />usually rated by water pressure. (Rain bird CD-ROM: What is an Irrigation System?: <br />Components). <br /> <br />17 <br />