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The expansion vessel tube is a key component in closed-loop heating systems, connecting the expansion vessel to the boiler or heating circuit. This tube allows the expansion vessel to absorb pressure changes caused by thermal expansion of water, preventing excessive pressure buildup that could damage the system. Made from materials resistant to corrosion and high temperatures, it ensures reliable performance over time. Whether you are replacing a worn tube or installing a new expansion vessel, this part is essential for maintaining system pressure stability. Proper sizing and connection are important to avoid leaks and ensure the expansion vessel functions correctly.