A valve control assembly for a watering system including a decoder unit and provided with valve control outputs, a solenoid releasably attachable to a valve. The decoder unit is arranged in a substantially cylindrical shaped decoder body having a central axis. The solenoid is arranged in a substantially cylindrical solenoid housing. The decoder body and the solenoid housing are releasably attachable together so that in attached position their axes fall in the same line and their edges along which they are united have respective conforming recesses that are fitted together and prevent angular displacement. In the interior of the decoder body and the solenoid housing in the connection zone a hollow space is defined. Control wires connect the decoder unit, with the solenoid are placed in the hollow space. The control wires having a length to permit dis-assembly and replacement of any of the decoder unit and the solenoid.
