Hunter PGJ 4 inch pop-up Rotor. Hunter PGJ gear driven rotor sprayers can be mixed with Hunter gear-driven rotors on the same valve. Comes with 8 different nozzles that determine radius (spray length). Nozzle can be changed. The radius is also adjusted up or down 25% with a turn of a screw. The arc is easily adjustable from 40-360 degree's. by twisting the top of the sprinkler. It also features and extra large filter screen. 1/2 inch FIPT inlet.