The No1 selling brass impact sprinkler Patterned after our 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. Diffuser screw breaks water into smaller water droplets for uniform watering. Diecast white bronze PJ spray arm controls stream prevents side splash onto buildings and walkways.