Additional info Trailer steering / trailing axle automatic alignment centering kit - 1 control box in the cabin - 1 double acting distributor 12vdc type cetop3 - 1 Double piloted valve 3/8G - 1 Angle sensor + 1 protective cover It is mandatory to install a mechanical interlock axle for on-road use. AUTO CENTERING KIT 1 AXLE 1D/A 12V KW999R01V1