TORK 3000 series flush mounting photocontrols are a convenient solution for automatically switching pole lanterns, lawn and walkway lights ON at night and then shutting them OFF at dawn. Flush mounting photocontrols are easy to mount through a .6875" hole in a post, lantern or light fixture. Use the 74215 Replacement Locknut with the photocontrol's 3/4" long, 3/8" NPT threaded stem for quick and reliable mounting.