The Halstead electrode detection, including the gasket, is responsible for causing the spark that starts the burner. The electrodes are responsible for ensuring there is a flame present in the burner. This is an important task that ensures the boiler doesn't keep supplying gas while no flame is present.
Fits a number of Halstead boilers
Technical specification
TypeElectrodeManufacturer Model No988540Brand NameHalstead
Reviews
Halstead Detection Electrode Including Gasket 988540