The Glow-worm electrode derlite is responsible for causing the spark that starts the burner and is also responsible for checking if 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.
Colour is white
Fits a number of Glow-worm appliances
Technical specification
TypeElectrodeManufacturer Model NoS202629Brand NameGlow-worm