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The expansion vessel is a small chamber that is utilised to protect closed heating systems from excessive pressure. The expansion vessel is filled with air that acts as a cushion against surges in pressure within the system.
Part No: 1294358 / MPN: 110033F
Sorry, this part is now obsolete
Part No: 1294362 / MPN: 110034F
Part No: 1292158 / MPN: 450986