The front loop sensor fro many models of Husqvarna Automowers. This loop sensor board is used in 310, 315, 315X, 430X, 430XH, 450X, 450XH, 520, 520H, 550, & 550H models of Automowers.
 
Click here for more information about the front loop sensor.
 
Don't forget to order a chassis seal!