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The Monoelectrode spark plug is a combined ignition and flame sensing electrode used in gas burners. It both ignites the gas-air mixture and detects the presence of a flame, providing a safety function by shutting off gas if no flame is detected. This single-electrode design simplifies installation and reduces the number of components needed. As a critical part of burner spare parts, this spark plug is commonly replaced during burner servicing to ensure reliable ignition and safe operation. It is suitable for various gas-fired heating appliances, including boilers and furnaces.