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The siphon is an essential component in condensing boilers and some heating systems, designed to drain condensate safely while preventing flue gases from escaping. It creates a water seal that blocks harmful gases and allows acidic condensate to flow to a drain. Over time, siphons can become clogged or damaged, leading to boiler shutdowns or safety hazards. Replacing a faulty siphon restores proper drainage and ensures compliance with safety regulations. This part is typically made from corrosion-resistant plastic and is easy to install. Regular inspection of the siphon is recommended as part of boiler maintenance.