The Potterton Ignition Ionization gasket is the part located near the electrodes. Usually, there are two different types of electrodes: ignition electrodes and flame-sensing electrodes. The ignition electrode is responsible for creating the spark that starts the flame within the burner The flame-sensing electrodes are responsible for detecting whether there is a flame present in the burner. This is an important safety device that makes sure the boiler isn't still supplying gas without a flame.

Brand Name	Potterton