RainBird 5004-PC 4 in. Pop-Up Adjustable Arc Rotor 10 Pack. RainBird's 5000 Series sprinkler, being a tough middle-range gear-driven rotor, is perfect for commercial, residential, or athletic field operations. It is very easy to adjust to meet your specific needs and offers a wide variety of operation settings. This high quality product will quench your thirst for a reliable sprinkler system, as well as your plants'.