The Keston ignitor kit is complete with washers and screws for the pilot assembly of Keston C boilers. A pilot assembly normally includes a pilot bracket, injector, electrode, and thermocouple. The pilot flame ignites gas entering the boiler's main burner via the gas valve when the system is switched on. The pilot flame operates alongside the printed circuit board (PCB) and the rest of the pilot assembly for safe and efficient ignition.