The automatic air vent is a pressure safety device in the central heating unit. They work by using floatation to release an accumulation of air. As water flows through the complex cooling and heating system a float within the automatic air vent opens or closes depending on the water level. If the system contains no air, the float rises to the top and the vent remains closed until the water level drops.
- Comes with O-rings
- Fits the Ferroli Maxima 35 C and 35 S
- Fits the Ferroli Optimax 25 C and 25 S