Designed for a variety of uses where full circle sprinklers should not overthrow water into restricted areas. The body, arm, bearing sleeve and nipple are made of durable Delrin™ plastic. Proven impact drive with straight-through flow for superior performance in dirty water. Double-weighted arm for slower rotation and increased distance of throw. Adjustable arm spring for low-pressure and low-gallonage operation. No tools required to change nozzles.