Plastic 3-way pilot for reducing and sustaining valve, series 29-200 blue.
To regulate the pressure, the upper screw of the pilot is used. By tightening the screw, we will increase the equilibrium pressure, and loosening it we will decrease it.
The screw will be turned little by little so that the pressure stabilizes. When the desired pressure is reached, the screw position will be fixed by means of the nut.