Third Series Low Pressure: servo-assisted, NC (normally closed), dn 25 and 32mm. With flow regulator. Suitable for use with drinking water. Also available in the NO version (normal Third Low Pressure Series: 2/2 solenoid valve, servo-assisted, NC (normally closed), dn 25 and 32mm. With flow regulator. Suitable for use with drinking water. Also available in the NO version (normally closed). open) and bistable. With manual control for opening and closing the valve and removable coil by means of a yellow self-locking ring nut. Ideal for irrigation systems with rainwater recovery and supply from tank.mente open) and bistable. With manual valve opening and closing control and removable coil by means of a self-locking yellow ring nut. Ideal for irrigation systems with rainwater recovery and tank supply.