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The Sight glass is a vital observation window used in boilers and burners to visually monitor flame presence, combustion quality, and internal conditions. Typically installed on the burner housing or boiler door, it allows technicians to inspect operation without disassembly. Made from heat-resistant glass, it provides a clear view while withstanding high temperatures. Replacing a cracked or clouded sight glass is essential for safe and efficient system monitoring. This component is a common spare part for heating equipment maintenance, helping to ensure that your boiler or burner operates as intended.