The Rain Bird Brass Impact Sprinkler is patterned after their original impulse sprinkler, first patented by Rain Bird in 1933, with all the features and durability of modern engineering. Constructed of heavy-duty bronze and stainless steel, these impact heads deliver reliable performance season after season. Straight through water flow design for superior dirty water performance. Easy to install and adjust. Brass, bronze, and stainless steel construction lasts longer than competitors' zinc sprinklers. Adjustable deflector flap adjusts stream length from 20-foot (6 m) to 41-foot (12.5 m) radius. Diffuser screw breaks water into smaller water droplets for uniform watering. Die-cast, white bronze PJ™ spray arm controls stream, prevents side splash onto buildings and walkways.