The 42SA Simple Adjust Rotor 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. The protected closed-case design makes this sprinkler ideal for "creeping" grasses, sandy soil and other harsh surroundings. Water lubricated rotating stream operation is quiet and maintenance free. The many safeguards and trouble-free features built into our closed-case rotor sprinkler makes it the perfect choice for any home landscape.