The 3/3 series of products present a small-sized single body with four utilities according to the different models, in various configurations. First of all, the NC outlet with the NO air drain port comes with the 'C' function code and allows feeding separately four pneumatic rooms, in the absence of electric control.
Next, the code 'D' device is also an NC outlet which allows separately feeding no less than four pneumatic rooms, maintaining the pressure level in the absence of electric control. Finally, the outlet NO NC air drain port of function code 'A' is known for ensuring continuous supply in electric control absence.