The Worcester Bosch electrode causes the spark that begins combustion within the burner, while flame-sensing electrodes are responsible for checking if there is a flame present in the burner to make sure that the boiler doesn't keep supplying gas without a flame.
Comes with seal, nuts and bracket
Technical specification
Waist Sizeaa17cj19gxTypeElectrodeSupplier Part Number871860028A0Brand NameWorcester Bosch
Reviews
Worcester Bosch Spark and Ionisation Electrodes Set 871860028A0