The Rain Bird Simple Adjust Professional ¾” Inlet Gear Drive Rotor Sprinkler is a rugged mid-range 3/4" gear drive rotor, offering durability, performance and the convenience of easy arc adjustment from the top, for residential applications. Water lubricated rotating stream operation is quiet and maintenance free. The many safeguards and trouble-free features built into our closed-case rotor sprinklers make them the perfect choice for any home landscape.