Irritrol 430R 4" 430R Series Pop-Up Rotor with 1/2" Female Inlet Rapidly becoming a contractor favorite, the 430R rotor from Irritrol® offers everything you would expect from a ½” rotor. When your application calls for more than ordinary spray heads, but not enough for large rotors, we offer the 430R. With a familiar arc setting and the ability to quick check the left and right stops, the 430R is sure to save time on installation.