Worcester Bosch Outer Seal 125mm Exhaust Pipe Union 87290001670

The Worcester Bosch outer seal for the exhaust pipe union is a 125mm sealing component fitted where the flue or exhaust pipe meets the appliance. It closes the joint at the union, keeping flue products inside the flue path and holding back condensate that would otherwise track past the connection. It is supplied as a Worcester Bosch spare under part number 87290001670.

• The seal is cracked, hardened or flattened where it sits at the flue union
• Soot staining or condensate trails appear around the exhaust pipe connection
• Flue gas odour is noticeable near the appliance or at the union joint
• The boiler locks out or reports a flue-related fault after a service check
• The seal is dislodged or torn during flue removal or reconnection

• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
• Check the GC number on the appliance data badge against the models listed above before ordering.
• Cross-check the alternative number 1020249 against any previous documentation for the appliance.