The Gilmour pulsating Pattern Master sprinklers allow flexibility in watering unique-shaped lawns. The Flexible Pattern Ring has 12 adjustable points for controlling the distance of spray. By pushing up the red ring from underneath you reduce the distance, by pushing it down from the top until flat you maximize the distance. Pattern Master sprinklers also have a rotation control technology. You can adjust the trip lever and collars for full or partial coverage of your lawn. Water coverage of up to 5,800 sq. ft. (86 ft diameter) and special speed control provide you with even watering coverage of your lawn. It has a durable flow-through base for stability and is made of impact resistant, rust-proof polymer construction. Backed by the Gilmour lifetime guarantee, this sprinkler is a must-have for any yard.