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The expansion vessel pipe for Baxi boilers connects the expansion vessel to the heating circuit, allowing the vessel to absorb pressure fluctuations as water expands when heated. This pipe must be flexible yet strong to withstand system pressure and temperature changes. A damaged or leaking expansion vessel pipe can cause pressure loss and boiler inefficiency. Replacing it is a common repair during boiler maintenance. This part is designed for Baxi models and helps maintain stable system pressure, protecting other components from stress.