Orbit 55461 Voyager 4-Inch Adjustable Pop-Up Gear Drive Rotor Sprinkler Spray Head, 2-Pack 2-pack of quiet, dependable gear drive sprinkler heads with consistent and complete water coverage Ideal for medium to large lawn areas, with a spray that adjusts from a 20 - 40 ft. radius in a part or full circle Easily accessible filter built in to protect nozzle from clogging Compatible with all major brands of gear drive rotors, including Rainbird, Hunter and Toro 4 inch pop-up height, with a standard 3/4 inch inlet thread