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The flow tube is a key component in the hydraulic circuit of a boiler, responsible for directing the flow of heated water from the heat exchanger to the heating system. This tube is designed to handle high temperatures and maintain consistent water flow. If your boiler is experiencing reduced heating performance or unusual noises, a damaged flow tube could be the cause. Replacing it with a compatible part restores proper circulation and system efficiency. The flow tube is a common replacement part during boiler servicing and is suitable for various heating equipment models.