Potterton Automatic Air Vent 5122330

Baxi Air Vent 5122330

This part fits :

Baxi DUOTEC HE 40
Baxi DUOTEC HE A 40
Potterton STATESMAN COMBI (EXPORT)
Potterton STATESMAN FLOWSURE
Potterton STATESMAN FLOWSURE +
Potterton STATESMAN FLOWSURE L
Potterton STATESMAN FLOWSURE L +
Potterton STATESMAN HEATSTORE (EXPORT)
Potterton STATESMAN SYSTEM
Potterton STATESMAN SYSTEM L
Potterton HEATMAX COMBI 24HE
Potterton HEATMAX COMBI 28HE
Potterton HEATMAX COMBI 33HE
Potterton PROMAX HE PLUS A SYSTEM
Potterton PROMAX HE PLUS A SYSTEM

The automatic air vent is a safety device within the central heating unit.

They work by using floatation to release an accumulation of air.

As water flows through the heating/cooling system, a float within the automatic air vent opens or closes depending on the water level.

If the system contains no air, the float will be pushed to the top and the vent will be closed until the water level drops.