Worcester Bosch Adaptor Expansion Vessel Assembly 8716117067

The adaptor expansion vessel assembly is a Worcester Bosch spare that connects the expansion vessel to the boiler's heating circuit on Greenstar i ErP System models. It carries the vessel connection through the casing and hydraulic block, allowing the vessel to absorb expansion as the system water heats. The assembly is supplied as a complete unit so the connection can be renewed without disturbing the rest of the hydraulic arrangement.

• System pressure drops repeatedly and will not hold a steady reading on the gauge
• Water weeping or staining around the expansion vessel connection or the adaptor body
• Corrosion, scale build-up or a crusted joint where the adaptor meets the hydraulic block
• Pressure relief valve discharging because the vessel can no longer take up expansion
• Vessel connection feels loose, cracked or has been cross-threaded during earlier work

• Check the GC number on the appliance data badge against the compatibility list to confirm the correct variant
• Confirm the part number 8716117067 or the alternative number 1031143 before ordering
• Inspect the sealing washer or O-ring at the vessel connection and renew it if it is flattened or perished
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.