Worcester Bosch Expansion Vessel Connector 87161133040

The Worcester Bosch expansion vessel connector, part 87161133040, is a pipework adaptor that links the expansion vessel to the hydraulic circuit inside Worcester Bosch Greenstar i System appliances. It carries system water between the vessel and the boiler's internal pipework, allowing the vessel to absorb the expansion that occurs as the system heats up. It is catalogued as an adaptor and connector within the expansion vessels, tanks and cylinders spare parts group.

• Water weeping or dripping at the joint between the connector and the expansion vessel
• Boiler pressure dropping and returning only after the system is topped up
• Corrosion, scale or rust staining around the connection
• Cracking, distortion or thread damage on the connector body
• Pressure swinging widely as the system heats, pointing to a vessel that is not holding its charge

• Check the GC number on the appliance data badge against the compatibility list before ordering.
• Confirm the exact model and serial number, as the Greenstar i System range uses more than one connector variant.
• Check whether a sealing washer or O-ring is needed at the joint and order it separately if the existing one is perished.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.