Worcester Bosch O-Ring 2.40 x 7.60mm Nitrile 87161408080

The Worcester Bosch 87161408080 is a nitrile rubber O-ring with a 2.40 x 7.60mm internal diameter. It forms a compression seal at joints between pipework and internal components of a heating appliance, including heat exchangers and condensate traps. Nitrile is used here because it holds its shape against hot water and the additives found in a sealed central heating circuit.

• A weep or drip at a pipe-to-component joint that reappears after tightening
• Water staining, crusting or corrosion around a heat exchanger or condensate trap connection
• The O-ring has flattened, hardened or cracked and no longer sits proud of its groove
• Scale or debris embedded in the seal face, preventing it from seating cleanly
• A joint that has been disturbed during other work and will not seal again on reassembly

• Check the GC number or appliance serial plate to confirm the model before ordering, as this O-ring is used across a large number of Worcester Bosch appliances.
• Confirm the previous number ZBUNC260 against the part you are removing, as it may be stamped or listed on older documentation.
• Check whether the joint also needs a gasket or washer, as several connections use more than one sealing component.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.