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This video shows in detail how I replaced the expansion vessel (10 litre Part #5114692) on my Main Eco 30 Combi boiler. It shows how I replaced the pressure relief valve PRV and the air vent.

The vessel is also used in other combi-boilers such as Potterton Apollo / Heatmax / Promax Gold. Baxi Duo Tec 33 44 HE and many more.

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